ur sister

Best definition
ur sister
just like saying ur mom except for a sister as indicated in title
boy 1:u kno who i screwed last night?

boy 2:UR SISTER!!

boy 1:hey, that was mean 🙁
ur sister: define #2
Ur sister
Ur sister a sibling that is your brother just a girl.
Person A: i had fun our sleepover last night.

Person B: i had fun with ur sister last night.

via giphy

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