A riddle was printed in the Atlanta (GA) Journal-Constitution on January 18, 2005:
 
Q: What do you call someone who never gets angry?
A: A no-mad (nomad).
   
“What type of people never get angry? The nomads” was posted on Reddit—Dadjokes on July 25, 2018.
 
   
Newspapers.com
18 January 2005, Atlanta (GA) Journal-Constitution, “Just for Fun,” pg. E4, col. 1:
Q: What do you call someone who never gets angry?
A: A no-mad (nomad). 
 
Twitter
Whiskey Beerback
@Waskonator
Does it surprise anyone else when Nomads get angry?
1:00 AM · Oct 10, 2008·Twitter SMS
   
Twitter
John Stewart
@stooey
“they sure get angry for a people called nomads”
3:00 AM · Dec 11, 2008·Twitter Web Client
   
Twitter
Zen Jar
@zenjar
Do nomads ever get angry? (via #zenjar )
5:53 PM · Aug 22, 2009·Twitter Web Client
 
Google Books
Double Dealing III:
The Pun
By Chuck Closson
Xlibris Corporation (Xlibris.com)
2013
Pg. 242:
Nomads can get angry.
 
Reddit—Jokes
Posted by u/[deleted] December 16, 2015
Name one type of person that will never get angry
A nomad.
     
Reddit—Dadjokes
Posted by u/ConanHuynh July 25, 2018
What type of people never get angry?
The nomads.
 
Reddit—Dadjokes
Posted by u/BlankPhotos July 24, 2020
What type of people never get angry?
The nomads