"ur mum" is not ur actualy ur mum but a person that represents ur mum
it is used when you are really stoned or dont hav a good enough come back
Jon: what does my cooking taste like?
Michael: ur mum
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Something that can be said as an answer to everything, it can also replace a noun in a sentence. You can also turn around a few words from the last sentence said and add ''ur mom'' somewhere.
Note how when used, it will cause the person you're talking with to automaticaly have sexual thoughts about his mother.
Random: yeah it's a bit tight
You: ur mom is tight
Random: i'm eating buffalo wings, it's dirty as I type but I really like wings
You: ur mom like it dirty
Random: brb bathroom
Random (several minutes later): back, was a bit long, was out of wiping paper lmao
You: me too but ur mom wiped me
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a lame comeback often used by annoying 6th grade boys
Someone: "Whatcha Doin?"
Someone Else: "UR MOM!"
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You said something weird, bad, something wrong, etc. Someone may reply with "Ur Done"
Kai said some weird ass shit, i had to hit him with the " Ur Done "
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a phrase used by someone who has no desent come back or is just a bit of a retard
A: what you doin tonight?
B: ur mum!
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A joke either referring to your mom being obese or your mom being very hot.
"I fucked ur mom" or "Ur mom is a cow"
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Amber: "God Kayla, you are such a bitch in the mornings."
Kayla: "Well I havn't had my coffee yet fucktard so.....UR MOM."
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