A watermelon is a fruit. A cucumber is botanically also a fruit, but is often considered to be a vegetable.
 
”#stuffdansays Cucumber is the watermelon of the vegetable world” was posted on Twitter by Ryan James on January 6, 2010. “I declare the cucumber the watermelon of the vegetable world” was posted on Twitter by Marcy Scott Lynn on April 23, 2010. “Cucumbers are the watermelon of the vegetable world” was posted on Twitter by Peter Ianni on January 25, 2011. “Cucumbers are the watermelon of the vegetable world — cool, crisp and incredibly refreshing” was posted on Twitter by The Times-Tribune on July 27, 2019.
 
“cucumbers are the watermelons of vegetables” was posted on Twitter by 恺乐 on March 21, 2013. “Cucumbers are the watermelons of vegetables #connections” was posted on Twitter by Connie Wang on August 21, 2013. “Cucumbers are the watermelons of vegetables” was posted on Twitter by Sam on August 10, 2014. “Cucumbers are the watermelons of vegetables” was posted on Reddit—Showerthoughts on November 19, 2018.
 
Related cucumber-watermelon sayings include “Cucumbers are just baby watermelons,” “Cucumbers are just diet watermelons,” “Cucumbers are just savory watermelons,” “Cucumbers are just savoury watermelons,” “Cucumbers are just tasteless watermelons,” “Cucumbers are just unsweetened watermelons,” “The best part of a cucumber is the worst part of a watermelon,” “The good part of a cucumber is the bad part of a watermelon” and “Watermelons look like fat cucumbers.”
   
     
Wikipedia: Cucumber
Cucumber (Cucumis sativus) is a widely-cultivated creeping vine plant in the Cucurbitaceae gourd family that bears cucumiform fruits, which are used as vegetables. There are three main varieties of cucumber—slicing, pickling, and burpless/seedless—within which several cultivars have been created. The cucumber originates from South Asia, but now grows on most continents, as many different types of cucumber are traded on the global market.
   
Wikipedia: Watermelon
Watermelon (Citrullus lanatus) is a flowering plant species of the Cucurbitaceae family. A scrambling and trailing vine-like plant, it was originally domesticated in Africa. It is a highly cultivated fruit worldwide, with more than 1,000 varieties.
         
Twitter
Ryan James
@ryanjames85
#stuffdansays Cucumber is the watermelon of the vegetable world.
1:28 AM · Jan 6, 2010·Twitter Web Client
   
Twitter
Marcy Scott Lynn
@marcyscottlynn
I declare the cucumber the watermelon of the vegetable world.
1:43 PM · Apr 23, 2010·Twitter Web Client
 
Twitter
Peter Ianni
@HeyPeterManEC
“Cucumbers are the watermelon of the vegetable world”
11:33 AM · Jan 25, 2011·Twitter SMS
     
Twitter
elr01wc
@elr01wc
cucumbers: the watermelons of the vegetable world? (though i suppose technically another fruit)
10:23 PM · Jul 8, 2011·Twitter Web Client
 
Twitter
Morgan Kurtz
@the_MOTUS
Cucumbers are like the vegetable version of watermelon; icky.
9:27 PM · Jul 21, 2011·Twitter SMS
   
Twitter
KimberlyJordanAllen
@KimJordanAllen
Cucumbers are the watermelon of the vegetable world.
3:38 PM · Apr 5, 2012·Twitter Web Client
   
Twitter
K R
@kroefs
Cucumbers are the watermelon on the vegetable world
@keeleyrobinsonn
10:47 PM · Sep 6, 2012·Twitter for iPhone
     
Twitter
恺乐
@lunastris
omnomnom cucumbers are the watermelons of vegetables
6:27 PM · Mar 21, 2013·Twitter Web Client
   
Twitter
Connie Wang
@ConnieWang7
Cucumbers are the watermelons of vegetables #connections
11:50 PM · Aug 21, 2013·Twitter for iPhone
   
Twitter
Tina Louise Mackey
@CanadianCharmer
Cucumber is the watermelon of the vegetable world 😊
9:38 PM · Jan 27, 2014·Twitter for Android
 
Twitter
$han
@shnanananon
Cucumbers are the vegetable version of watermelons
5:53 PM · Jun 4, 2014·Twitter for iPhone
   
Twitter
Kelsi Bailey
@BaileyKelsi22
Cucumbers are the vegetable version of watermelon. Watermelon
8:02 AM · Aug 1, 2014·Twitter for iPhone
     
Twitter
Sam
@_SammyMariee
Cucumbers are the watermelons of vegetables
4:05 PM · Aug 10, 2014·Twitter for iPhone
 
Twitter
Jeannie
@jeannieologist
#cucumbers are the #watermelon of the #vegetable world.
8:30 PM · Jun 11, 2015·Twitter for iPhone
     
Twitter
Jasmine
@_callmejasmine_
Cucumbers are the vegetable equivalent of watermelons
11:11 AM · Nov 13, 2015·Twitter for Android
 
Twitter
Hannah Shultz
@hannaheshultz
Cucumbers are the watermelon of the vegetable world. #hadtosayit #randomtweet
8:35 PM · Jan 6, 2016·Twitter for iPhone
     
Twitter 
big mab
@KaylaTaweel
Cucumbers are the watermelons of vegetables
6:38 PM · Jul 2, 2016·Twitter for Android
 
Twitter
Luca James
@iamlucajames
Cucumbers are just vegetable watermelons #FoodThoughts
9:56 PM · Aug 15, 2016 from St. Paul, Alberta·Twitter for iPhone
 
Twitter
uncle jims worm farm
@FarmUncle
cucumbers are the watermelons of veggies
7:50 PM · May 16, 2017·Twitter for iPhone
   
Twitter
Cherry Coke Cunt
@bonerattlinbitx
“Cucumbers are the watermelons of the vegetable world.” -@yikessikey
11:08 PM · Apr 8, 2017·Twitter for iPhone
   
Twitter
Paul
@PirlBaker
Cucumbers are the vegetable version of watermelons.
7:22 PM · Dec 6, 2017·Twitter for Android
   
Twitter
Claire Anderson
@clur09
Cucumbers are the vegetable version of watermelon #Cucumber#Watermelon
10:12 PM · Mar 18, 2018·Twitter for iPhone
 
Twitter
Ian Sundstrom
@IanSundstrom
Hot take: cucumbers are just tiny veggie watermelons.
12:59 PM · Jul 12, 2018·Twitter for Android
     
Twitter
Erin Inouye
@er_inouye
“Cucumbers are like the watermelons of vegetables.”
8:01 AM · Nov 7, 2018·Twitter for iPhone
 
Twitter
kenna ♥
@mekennalol
cucumbers are just vegetable watermelons
11:16 PM · Nov 17, 2018·Twitter for iPhone
 
Reddit—Showerthoughts
Posted by u/18snlv November 19, 2018
Cucumbers are the watermelons of vegetables
COMMENTS
Joodropinn
Cucumbers are actually a fruit too….
MrGooglyman
They’re both part of the cucurbitaceae family, and cucumber is technically a fruit not a vegetable
 
Twitter
The Times-Tribune
@TimesTribuneKY
Cucumbers are the watermelon of the vegetable world — cool, crisp and incredibly refreshing. https://thetimestribune.com/news/lifestyles/recipe-cucumber-recipes-refresh-with-delicious-flavor/article_7f743d48-d151-5669-86d2-f0fe22f228e7.html#utm_campaign=blox&utm_source=twitter&utm_medium=social
12:00 PM · Jul 27, 2019·BLOX CMS
 
Reddit—Showerthoughts
Posted by u/Spikester August 4, 2019
Cucumbers are the watermelons of the vegetable family.
     
Twitter
𝐷𝑖 𝑀𝑜𝑙𝑡𝑜 ఌ︎
@Moltoface
Hot take
Cucumbers are the vegetable version of watermelons
8:34 PM · Aug 22, 2020·Twitter for Android
 
Twitter
Mama Long Legs
@ratchet_rachel2
Cucumbers are just vegetable watermelons
1:53 PM · Nov 5, 2019·Twitter for iPhone
     
Twitter
sana
@sanamithwanii
cucumbers are the watermelons of vegetables
4:34 AM · Apr 20, 2020·Twitter for iPhone
 
Twitter
Madison
@JMadisonD17
Watermelons are the fruit version of cucumbers and cucumbers are the vegetable version of watermelons
8:43 PM · Feb 21, 2021·Twitter for iPhone