A politer way of saying to a friend, i'm going to fuck your sister then sloppy jizz over her tits
Dave: Bobby, since you wouldn't make me a brew its Time To Chuck My Muck Over Your Sister's Jubblies
by Greg_the_Smeg February 7, 2019
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An sarcastic exclamation that can be used in a variety of ways. Usually used to to emphasize how glaringly obvious something that has been said is.
A: I had to go to school yesterday.
B: Well, shit in my mouth and call me your sister - student's going to school? Really?
by DarkLite January 17, 2007
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On April 21st of every year National Fuck Your Freinds Sister Day starts on this day you boy or girl will go to one of your friends houses and they are obligated to consent to having you fuck their brians out so in turn on this day woman's right to choose is also temporarly suspended
Josh texts carl: yo its National Fuck Your Freinds Sister Day im coming over to fuck your sister
Carl: Go ahead im about to Fuck Yours
Josh: Narly dude
by DizzyCannon7211 April 19, 2020
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On June 9th it is considered to be National Kiss Your Step Sister Day. On this day it is highly recommended that you make out with your step sister. Any other day it would be considered incest, but on June 9th it is encouraged!
Person 1: Bro on June 9th you gotta make out with your step sister.

Person 2: Why June 9th?
Person 1: Cuz it’s National Kiss Your Step Sister Day, duh.
by yomommathic April 18, 2020
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a stupid comeback phrase that's used for virtually everything, even if it doesn't make any sense whatsoever
Friend #1: dude! i saw your mom last night! she was hot!
Friend #2: your best friend's sister!
Friend #!: you have a sister!?

dude: what happened last night!?
dude 2: your best friend's sister!
dude: shut up!
by dawg69 June 21, 2009
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Worse than “ur granny tranny” or “ur brothers a mother”. Every time this is said, the victim will implode into a ball of guts then blast into a shower of blood.
Joe: “Your gay.”
John: “Don’t make me do it.”
Joe: “Do what, pussy?”
John: “You’ve taken it too far.”
John: “Your sisters a mister.”
Joe: *Implodes then blasts out covering the walls in a red layer of blood and guts*
by ThatGuy286437 March 25, 2018
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Kick your sister day is on august the second so they should beware of where they go on that one day
Kick your sister day is when you are able to kick the ever living daylights out of your sister
by Gavin Mamalton August 1, 2023
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