The word “assassin” breaks into “ass-ass-in.” “hmm.  So, ASSASSIN == ASS + ASS + IN. Two butts and an ‘in.’  Interesting..” was posted on Twitter by Richard Laskey on June 3, 2010. “What has two butts, and is deadly? An ASSASSIN” was posted on Twitter by ★アンドレア•^☆人☆^ on December 14, 2011.
 
A riddle version was posted on Reddit—Dadjokes on June 10, 2018:
     
Q: What has two butts and kills people?
A: An assassin.
 
 
Twitter
Richard Laskey
@rlaskey
hmm.  So, ASSASSIN == ASS + ASS + IN. Two butts and an “in.”  Interesting..
6:21 PM · Jun 3, 2010·Twitter Web Client
   
Twitter
★アンドレア•^☆人☆^
@neko_mimi_ninja
What has two butts, and is deadly? An ASSASSIN.
~one if the boys in geometry said that~
10:55 PM · Dec 14, 2011·Twitter for iPhone
   
Twitter
lit sampson
@okay_chini
Assassin has two butts
8:13 PM · Jan 4, 2012·Twitter for Android
   
Twitter
Liquid Television
@liquid_tv
RT @triphibian: Historical background: Assassins were given their name because they all had two butts.
4:27 PM · Oct 8, 2012·Hootsuite
   
Twitter
eggplantpapi
@Gourtez
Assassins have two butts hehehehe
5:23 PM · Oct 28, 2013·Twitter for iPhone
   
Twitter
Migeru
@SolarNarwhal
What do you call a murderer with two butts?
An assassin
1:42 AM · Jul 24, 2016·TweetDeck
   
Twitter
Lekter
@ahmed_alzahaf
What kind of contract killer has two butts?
An assassin.
1:00 AM · May 22, 2018·Twitter for iPhone
   
Reddit—Dadjokes
Posted by u/LeCrowing June 10, 2018
What has two butts and kills people?
An assassin
 
Twitter   
Dad Jokes
@Dadsaysjokes
What has two butts and kills people?
An assassin…
4:48 PM · Jun 10, 2018·Twitter for iPhone
   
Reddit—Jokes
Posted by u/supercooldude9876 June 15, 2020
What has two butts and kills people?
An assassin
   
Reddit—Jokes
Posted by u/trashnash007 October 18, 2019
What has two butts and kills people ?
An assassin
 
Reddit—Dadjokes
Posted by u/Sh3dinja July 28, 2020
What has two butts and kills people?
An assassin
COMMENTS
Radiationcover
Killer joke