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sister slammer 

The act of screwing your sister.
Not a name to be proud of.
Nasty, gross and wrong.
Usually due to country lifestyle.

see incest, inbred, redneck.
Random Guy: Dude, did you hear? Last night john screwed his sister.

Random Guy2: Ew... Bekka? He's a fuckin' sister slammer
sister slammer by bradski October 10, 2007

sister-mom 

When someone's mom looks so young she could be their sister.
Jenny is coming to the party and she is bringing her sister-mom. I saw Chris shopping with his sister-mom.
sister-mom by jillyjillz May 2, 2011

Sister Snatched

To Sister Snatch something is snatch or pull something in a James Charles manner.
Did you see her weave was Sister Snatched?
Sister Snatched by lol get rekt m8 February 28, 2019

Sister Fister

A person who fists peoples sister
Sister Fister by me March 1, 2004

sister code 

Sister Code is an excuse one sister will use to not have sexual relations with someone who has already slept with their sister. The Sister Code doesn't exist and is only used when the girl is an actual prude. If a girl uses this term with you, she is just trying to politely say "You're a fat slob and you need to move on!".
I do like you but I can't have sexual relations with you because of "Sister Code"!
sister code by wisdomson June 12, 2014

sister sammy 

sister sammy by Korline2020 December 1, 2016