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your sister 

One hot piece of ass. Penises can be found in her mouth, pussy, and ass.
Damn, your sister is hot!
your sister by Crackalac July 1, 2003

Hit your sister day 

Grab your sister, smack her in the face and if anyone gets mad at you for it say its smack your sister day
Friend: *smacks their sister*
Friend 2: Dude!! Why did you do that?!?
Friend:Dont worry, its Hit your sister day
Hit your sister day by Aliee00000 October 26, 2019

Your Sister Mister 

An insult that has the same effect as your mom gay.
Friend 1: Your Mum Gay
Friend 2: Your Sister Mister
Friend 1: *Dies From the Insult*

kiss your sister 

Nothing exciting; not good or bad. Often an expression used when something good offsets something bad, and you come out even, i.e. in card games where the points for a hand may split evenly.
How was your day?

Eh, you know, kiss your sister. A little up, a little down.
kiss your sister by bc73 December 14, 2010

your sister looks like a wookie

Like it sounds. Also the name of a song by the band called Analy Inserted Angle Grinders from Dominic College in Tasmania, Australia.
OMFG YOUR SISTER LOOKS LIKE A WOOKIE(Insert chewbacca noise here).

national punch your sister across the face day 

november 2-3 especially when there name is carys yates and they are 16 make sure to slap em silly
“happy national punch your sister across the face day”