It is a
basic way to ignore answering a
question. It can also be used to come-back from a burn, however most people don't think it to be a very good come-back. The main use of it is between 7-11 year old
children.
"
Hey, want some pizza? I just bought it-"
"
Ur mom"
////////////////////////////////////////////
(In an argument)
"At least I didn't eat the old
cheese-it on the ground!"
"Ur mom"