ur sister 

an un-common word used in any insult unlike ur mom.

ex: "hey Jimmy i ate 12 big macs for supper last night"
Bob "well i ate ur sister last night"

ur sister by ttttoday junior February 19, 2019

Ur sister 

that cute bitch i be fucking

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 by Happyhappy_cupcake40 June 24, 2018

Ur sister 

A bitch u can smash

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

ur sister 

ur mom and ur dad fucking

ur sister was born

ur sister by ur mommmmmmmms a hoe January 16, 2020