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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 :(
by c00kie monsta September 02, 2006
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2
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
by Happyhappy_cupcake40 June 24, 2018
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