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Ur sister 

Person A: hey man what are you doing?
Person B: ur sister, bitch
Ur sister by LilBoiDicaprio November 22, 2019

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 by c00kie monsta September 3, 2006

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.

Ur sister 

Micheal: what u do last night
Jason: smash ur sister
Ur sister by Brownskin_squad 25 February 24, 2019

Ur sister 

Ur sister is ur moms daughter.
Me:Dad do I have a sister
Dad:Ye
Me:Who?
Dad:Ur sister
Ur sister by B/4h December 14, 2019