“Freshman Fifteen” refers to fifteen pounds of weight gain that freshmen sometimes gain. Many people gained weight during the 2019–20 coronavirus pandemic and the subsequent quarantine. The weight gain was called “Quarantine Fifteen” or “Quarantine 15.”
   
“My coworkers are calling it ‘the Quarantine 15’” was posted on Twitter by Susan L. Hedglin on March 10, 2020. “is anyone talking about putting on the ‘quarantine 15’ yet” was posted on Twitter by “you boys Jewish?” on March 12, 2020. “This quarantine is gonna make us all gain fifteen pounds. The Quarantine Fifteen” was posted on Twitter by Ku later on March 12, 2020. 
       
“Quarantine Fifteen” was entered in the Urban Dictionary on March 22, 2020. “Quarantine 15” was entered in the Urban Dictionary on March 25, 2020.
   
 
Wikipedia: 2019-20 coronavirus outbreak
The 2019–20 coronavirus pandemic is an ongoing global pandemic of coronavirus disease 2019 (COVID-19), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The outbreak was first identified in Wuhan, Hubei, China, in December 2019, and was recognised as a pandemic by the World Health Organization (WHO) on 11 March 2020.
       
Twitter
Susan L. Hedglin |罗珊
@susanhedglin
Replying to @adamfeuerstein
My coworkers are calling it “the Quarantine 15”
7:42 PM · Mar 10, 2020·Twitter for iPhone
   
Twitter
you boys Jewish?
@DoubleEBooks
is anyone talking about putting on the “quarantine 15” yet
2:19 AM · Mar 12, 2020·Twitter Web App
 
Twitter 
Ku
@EstherKuKu
This quarantine is gonna make us all gain fifteen pounds. The Quarantine Fifteen.
8:11 PM · Mar 12, 2020·Twitter for iPhone
 
Twitter
fiona macdonald
@fionagmacdonald
you’ve heard of freshman fifteen but now it’s time for quarantine fifteen
12:32 PM · Mar 13, 2020·Twitter for iPhone
     
Twitter   
amelea renshaw
@amelearenshaw
The Freshman 15 has nothing on the Quarantine 15
9:07 PM · Mar 13, 2020·Twitter for iPhone
 
Twitter
Gary Sheehan
@gmsheehan
Broke: the freshman 15
Woke: the quarantine 15
6:16 PM · Mar 14, 2020·Twitter for Android
 
Twitter
Ashley Fern
@disco_infern0
quarantine 15 is the new freshman 15
9:24 PM · Mar 15, 2020 from Manhattan, NY·Twitter for iPhone
 
Urban Dictionary
Quarantine Fifteen
Weight gain acquired during COVID-19 Quarantine Period; fueled by boredom and nervous eating .
I lost my Freshman Fifteen in time for Spring Break but it’s coming back as the Quarantine Fifteen.
by OffLeash2017 March 22, 2020
 
Urban Dictionary
quarantine 15
as a result of being in quarantine, you don’t get any exercise and gain 15 kilograms/pounds. you can use any number from 13-119, but generally its 15. the name comes from the term “freshman 15”, when freshmen don’t have anyone to cook for them and they eat nothing but mcdonalds and starbucks muffins.
“Man, Dave came down with a case of quarantine 15.”
“Yeah, I’ve done nothing but gaming and watch tv, I have the quarantine 30
by armageddon ham March 25, 2020
         
Choose 901 (Memohis, TN)
Digitally Doing Life in “The M”: Virtual Events & Happenings
SHELBY SMITH, APRIL 13, 2020
(...)
Thanks to the Kroc Center of Memphis, there are handful virtual fitness classes going down that’ll keep that Quarantine-fifteen from creeping up on us.
 
The Cornell Daily Sun (Ithaca, NY)
April 23, 2020 OPINION
SMITH | Addressing the “Quarantine 15”
By Emma Smith
(...)
I’m used to hearing frustrating, diet-culture fueled comments on the internet, but when I first heard jokes like these about staving off the “quarantine 15,” they — as the kids say these days — “hit different.”
 
Ochsner Health
Gaining Weight at Home? Tips to Avoid the Quarantine Fifteen
BY MOLLY KIMBALL, RD, CSSD
Published: April 28, 2020
The coronavirus pandemic has shifted just about everyone’s routines. Chances are, it’s shifted your nutrition or fitness regimens, too. But you don’t have to let stress and snack foods take over your weight loss goals.
   
WZDX (Huntsville, AL)
The “Quarantine Fifteen”: Why you should stop stressing over the scale
A dietitian on why you should stop worrying about gaining weight, and start being more critical about what foods you’re eating during this time to feel your best…
Author: Sydney Stallworth
Published: 8:50 PM CDT May 6, 2020
Updated: 10:07 PM CDT May 6, 2020
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HUNTSVILLE, Ala. —
Have you heard of the “Quarantine Fifteen”?
 
People across the country are worried about gaining weight during the pandemic. We looked into it, and the scale might not be the thing you should be stressing about.
         
MedicineNet
The ‘Quarantine 15’: Weight Gain During COVID-19 Pandemic
By Debbie Koenig
May 24, 2020—Life in lockdown has disrupted all our lives, creating the perfect setup for putting on pounds. While social media users jokingly refer to it as the “Quarantine 15,” Rae Brager estimates she’s gained about 8 pounds since her quarantine started.
 
KDKA CBS (Pittsburgh, PA)
Experts Offer Advice On How To Lose The ‘Quarantine Fifteen’
By Celina Pompean iJuly 8, 2020 at 7:36 am
PITTSBURGH (KDKA) – Being stuck at home for months during the coronavirus pandemic has changed the way people do a lot of things, and for some, it’s changed their bodies.
 
Staying home for days at a time can lead to eating more than usual.
 
Local nutritionist Jackie Hale has some tips to get rid of what is being called the “quarantine fifteen.”
     
The Northwest Indiana Times
Fighting the ‘Quarantine 15’
Christine Bryant Times Correspondent Jul 24, 2020
If you’ve put on a few extra pounds these last few months, you aren’t alone.