when you're not funny, so you say "ur mom" because you're probably a depressed bitch with no life.
Chad is so not funny. he keeps saying "ur mom". typical Chad.
a large type of cow that is very pretty and enjoys being milked
person one "my favorite cow is ur mom"
ur mom is a word alot of kids use to make fun of other kids ones that dont have a mom it is a fun word to use for kids that dont have a mom
i did ur mom last night
other kid : i dont have one
i know
Ur mom is an epic comeback to use against someone. It will catch then off guard not will not know how to respond.
Ur mom use it while you can.
Tommy "I wonder who smells like raw fish"
Jimmy "I bet it's Daniel"
Daniel "no, it's ur mom"