Something people who are retarded, and don't have any comebacks and suck at life, so they respond with "ur mom"
Example of Someone Using a Your Mom Jokes: UR MOM! OHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!
by ur MOM!OOOOOOOHHHHHHH!!!!! March 04, 2015
Get the Your Mom Jokesmug.