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Ur mom is used when someone asks "what does this look like?" or "who is that?" etc. and you are too lazy to answer
"What is that?" It is ur mom"
the best response to any non yes or no question can be stopped by no u
jim:what was that?
bob:ur mom
jim:no u
bob: hi mom
“Ur mom” is a roast used by 12 year olds. It is a popular thing for fortnite players will say.
Girl- who is your crush billy ^w^~
Boy- Ur mom