Ur mom is often used as a joke when people say anything
Person a: ''What r u doing?'
Person b: 'Ur mom'
or \
whats on ur to-do list
ur mom
She's your Mom, and her name is Ur Mom. She is definitely, probably, totally Ur Mom.
Billy:Hey how are you man
Johnny boi: Ur mom
Billy: I am internally dying
person 1: hey look, its ur mom!
person 2: who's your mom??
Person 1: A hot woman.
the most op comeback that can even destroy god
jim: hey what did you do last night?
pablo: ur mom
jim: *dies*
jims mom: *dies*
pablo *alives*