Used as a comeback to pretty much anything.
Jim-What did you eat last night
Clark-UR MOM
David-What are you doing after school today
Mark-UR MOM
you-"hey you know joe"
other person-"no, who is joe"
you-"JOE MAMA"
other person-"what?"
you-" you don't get it? it's ur mom
a comeback to literally anything someone says to you
person 1: dude i just got a win on fortnite
person 2: dude i just got ur mom
person 1: im fat
person 2: ur mom is fat
person 1: shut up
person 2: ur mom shut up
“Ur Mom” Is someone that whoops you with a flip flop. Everyone has one. If you don’t then your an alien.
Ur Mom Whoops You With A Flip Flop.