“What did one vegan say to the other vegan?”/“We have to stop meating like this.”

“Meat” sounds like “meet.” A vegetarian riddle has been cited in print since at least 2003:
 
Q: What did one vegetarian spy say to the other vegetarian spy?
A: “We have to stop meating like this.”

 
A vegan version was posted on Twitter on August 22, 2012:
 
Q: What did one vegan say to the other vegan?
A: “We have to stop meating like this.”

   
   
21 September 2003, The Times-Picayune (New Orleans, LA), “Filling fare ; Books that savor healthy food” by Peg Kohlepp, pg. D7:
The text abounds in bad jokes and puns, such as “What did one vegetarian spy say to the other vegetarian spy? We have to stop meating like this.”
 
4 May 2007, Pensacola (FL) News Journal, “Jokes & Groaners,” pg. 1B, col. 3:
What did one vegetarian spy say to the other vegetarian spy? “We have to stop meating like this.”
         
Twitter 
Bo
@twitterbo
What did one vegetarian spy say to the other vegetarian spy?.... We have to stop meating like this….😊
7:53 PM - 14 Jan 2009
 
Twitter
Lots of Jokes
@lotsofjokes
Q. What did one vegetarian spy say to the other vegetarian spy?
A. We have to stop meating like this.
3:42 PM - 27 Nov 2009
   
Google Books
Blurring the Lines
By Jerry Zehr
Spirit Publishing
2012
Pg. 70:
There was a smattering of applause, so I decided to try some of my new jokes.
 
“Q: What did one vegetarian spy say to the other vegetarian spy?
A: We have to stop meating like this.”
 
Twitter
Gloveslave
@gloveslave
@MistressJezabel what did one vegan say to the other vegan? We have to stop meating like this
3:17 PM - 22 Aug 2012
     
Twitter
Casey Thein
@cthein24
@SpecialLovinnn What did one vegan say to the other??—- We have to stop meating like this. 😁😁
9:28 AM - 26 Jul 2013
   
Reddit—Puns
Meat Puns (self.puns)
submitted May 28, 2017 by Punsville
(...)
What did one vegetarian spy say to the other vegetarian spy? We have to stop meating like this.
 
Twitter
Hollywood
@rhett_goodner
What did one vegan say to another vegan?                                           
We have to stop meating like this
1:26 PM - 13 Oct 2017
 
Twitter
JOKEAZ
@jokeazcom
What did one vegan say to the other vegan?
We have to stop meating like this #jokes #meatingjokes #stopjokes #veganjokes
2:15 AM - 4 Dec 2017
 
Fast Company
05.29.18
A travel company just launched all-vegan tours
BY MELISSA LOCKER
There’s an old joke about one vegan saying to the other vegan, “we have to stop meating like this!” Now vegans can “meat” on vegan food tours, traveling the world telling everyone they meet that they are vegan.