Quesadiarrhea (quesadilla + diarrhea; “case of diarrhea”) is not a food served at Taco Bell restaurants, but there are jokes.
     
“Better than a quesadiarrhea” was posted on Twitter by Pagophilocephala on August 4, 2012. “As I was making quesadillas for dinner 3 tells her brothers we’re having quesadiarrhea” was posted on Twitter by Charming’s _ Snow on May 25, 2013. “quesadiarrhea #ew #FallonTonight” was posted on Twitter by Sarebear♣JF on June 6, 2914.
   
“Taco bell should call that new thing quesadiarrhea” was posted on Twitter by Joey Sharkwater on June 15, 2014. “Starting the Taco Bell diet today.  Will be ordering their new Quesadiarrhea” was posted on Twitter by Rob Stewart on August 6, 2014. “Quesadiarrhea” (Grilled Stuft Nacho by Taco Bell is shown) was posted on Reddit—Funny on June 11, 2015.
 
“What do you call a quesadilla that gives you upset stomach? A quesadiarrhea. (A case a diarrhea)” was posted on Reddit—Dadjokes on January 14, 2022.
 
Other quesadilla jokes include “I love Mexican food them chicken case of ideas be so good fr,” “Quesadilla? Better make it one dilla. I don’t think I could eat a whole case” and “Why did Sherlock Holmes visit a Mexican restaurant?”/“Because he was looking for a good case idea.”
 
     
Wikipedia: Quesadilla
A quesadilla (/ˌkeɪsəˈdiːjə/; Spanish: [kesaˈðiʝa]; Spanish diminutive of quesada is a Mexican dish consisting of a tortilla that is filled primarily with cheese, and sometimes meats, spices, and other fillings, and then cooked on a griddle or stove. Traditionally, a corn tortilla is used, but it can also be made with a flour tortilla.
         
Twitter
Pagophilocephala
@anononym
@heirofbreasts Better than a quesadiarrhea @CabaretHugs
1:34 AM · Aug 4, 2012·Tweetbot for iOS
   
Twitter
Charming’s _ Snow
@Princess_RN
As I was making quesadillas for dinner 3 tells her brothers we’re having quesadiarrhea.  Seriously I can’t make this shit up.
11:07 PM · May 25, 2013·Twitter for Android
   
Twitter
Sarebear♣JF |-/
@nanajamapuddin
quesadiarrhea #ew #FallonTonight
11:45 PM · Jun 6, 2014·Twitter Web Client
   
Twitter
Sarebear♣JF |-/
@nanajamapuddin
Replying to @jimmyfallon
@jimmyfallon and creating a quesadiarrhea 😉
10:34 PM · Jun 11, 2014·Twitter Web Client
 
Twitter
Joey Sharkwater
@JoeySharkwater
Taco bell should call that new thing quesadiarrhea
12:28 PM · Jun 15, 2014·Twitter for iPhone
   
Twitter
Rob Stewart
@robpekin
Starting the Taco Bell diet today.  Will be ordering their new Quesadiarrhea.
9:30 AM · Aug 6, 2014·Twitter Web Client
 
Reddit—DoXcallitY
Posted by u/tszigane September 7, 2014
Ordered the lunch special in a dirty Mexican restaurant
Call it a quesadiarrhea
       
Twitter
nat
@n_morse11
Cooper: “dont get the quesarito, it will give you a quesadiarrhea”
10:42 PM · Sep 19, 2014·Twitter for Android
   
Twitter
Damian Vanore
@DamianVanore23
QuesaDiarrhea #Recipes4Disasters
11:27 PM · Oct 11, 2014·Twitter for iPhone
 
Reddit—Funny
Posted by u/torkel-flatberg June 11, 2015
Quesadiarrhea
(Grilled Stuft Nacho by Taco Bell is shown.—ed.)
   
Twitter
Tyler Mammone
@tylermammone
Replying to @Reality_420
@Reality_420 Why wouldn’t you want some Taco Bell tho? Aside from the quesadiarrhea of course…
5:44 PM · Oct 29, 2015·TweetDeck
   
Twitter
Raven
@princeravenway
“Quesadilla? More like quesadiarrhea. Gives me a case o’ diarrhea.”
9:47 PM · Apr 22, 2016·Twitter for Android
   
Twitter
Amy Bowden
@ogamyb
Quesadiarrhea #DangerousFoods
5:53 PM · Nov 8, 2016·Twitter for Android
   
Twitter
kj #blm
@cupkayla_
“Hey guess what?”
What?
“I used to call quesadillas, quesadiarrhea”
8:28 PM · Jan 20, 2017·Twitter for iPhone
     
Twitter
𝔻𝕖𝕣𝕤
@andrs_rmrz
More like #QuesaDiarrhea
Quote Tweet
Kronk
@angelalfonso_
· Mar 7, 2017
#BringBackQuesalupa @tacobell https://twitter.com/franbeauchamp/status/839163008383389699
1:19 PM · Mar 7, 2017·Twitter for iPhone
 
Twitter
Woody Wood
@radiowoody
Breaking: @tacobell is bringing back the #Quesalupa! AND, for a limited time, buy a Quesalupa and get a QuesaDiarrhea FREE!
6:59 AM · Mar 11, 2021 from Nashville, TN·Twitter for iPhone
 
Reddit—Dadjokes
Posted by u/zfreakazoidz January 14, 2022
What do you call a quesadilla that gives you upset stomach?
A quesadiarrhea. (A case a diarrhea)