when someone tries to flame on you.
1: You built like ( Sum,,,Sum,,,) 2: Your momma
the 2022 version of ...something from 1900
friend:do you want to watch a movie
me:i wanna watch ur mom
friend:lets go to sleep
me:i wanna sleep with ur mom
friend:....
me:ur mom
friend:*slaps*
(this is a joke) someone that needs doing
Joe: What happened to my mom?
Ethan: ur mom was done because he needed it
Ur mom is used as an insult sometimes, but also may be used as a joke
Ur mom is so gay