It’s a dumb joke where boys try to defend there selfs, or to be “funny”.
Trevor: who you fuck last night?
Paul: Ur mom:)
Trevor: Damn it
by cacaboomboom April 18, 2020
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The world's most powerful insult, nothing can beat this.
Joe: I had such a great night last night.
Jim: I had such a great night with Ur Mom

The next day Jim gets beaten up.
by Burrito 🌯 May 20, 2018
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Ur Mom- a common comeback for when someone says....practically anything to you
Person 1:Hey Carl Whats up?
Person 2:Ur mom.

Person A:I had spaghetti last night.
Person B:I had Ur mom last night.

Joe:Im so worn out from basketball..
Carl:Im worn out from Ur mom.
by DtouchmycrumbD January 08, 2006
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My Friend: Hey what do you have to do after school today?

Me: Well I always have a to do list left for me.

Friend: What’s on it?

Me: Ur Mom
by hahaha6161 March 04, 2020
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Person one: What are you talking about? Humans breathe air!
Person two: Oh yeah, well, ur mom
(Person one shoots him/herself due to the shame and humiliation)
by mikeharr163 January 25, 2017
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can either be used as a random word which people seem to think witty and bugs the hell out of people, or, obviously, your mom
by i luv jesse mccartney April 25, 2005
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Use when someone is asking you a nosy question or just something stupid as hell.
Reminder: never say this in front of a person who does not have a mother.
SARAH: Hey, whatcha guys talkin' about?
ASHLEY: ur mom.
by Stephie Thong February 27, 2003
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