Sistercest

having a realtionship or sexual relationship with your sister's ex

I can't believe my sister is fucking my ex. She's committing sistercest.

by lexkatt December 2, 2010

Sisterection

Becoming aroused from contact, verbal or physical, from one's female sibling.

I couldn't concentrate on my maths homework, as I had a sisterection from the family gathering.

by Moses "Sandals" Jackson November 13, 2010

sisterectomy

The act of removing a sister from your life, either physically or metaphorically. First used in the Simpsons episode "My Sister, My Sitter".

Simpson? Look, we've already been down there tonight for a sisterectomy, a case of severe butt rot, and a leprechaun fight. How dumb do you think we are?

by ubersmith May 17, 2016

Dr.sisterfister

The man, the pope, the doc, the absolute gamer, a madlad thats has 3 monitors and a bunch of stash of anime girls, what a guy, yeah, oh but I have to warn you that he sometimes will ra-

and someone ship him with audiction, idk who, and idk when but...yes its real

Person 1: do you remember his name?, that youtuber I saw earlier in the streets?

Person 2: oh, the one that carries 2 anime body pillow?

Person 1: yea

Person 2: his name is Dr.sisterfister

Person 1: oh thanks

by Proxley the serwofun caretaker April 13, 2020

sisterfister

Strictly, one who indulges in a particular form of incest, using only their hand (see fister. Often used as a term of contempt, and shortened to "sissy" on account of their unadventurousness.

See also brotherfucker.

Your brother's such a sisterfister, you know.

by Lucifer B September 20, 2005

Sisterfister

Adjective meaning an alternative, clean version to Mother Fucker

*joey smacking Sarah on the butt
Sarah - "Ouch you sisterfister"

by Hink68PMMF October 25, 2017

Sisterfister

its the female of rare species called brofister, it was discovered in youtupia jungles at 2017 by the famous scientist felix kelberg pergananet

and always sisterfister!!!!

by RoloxX September 2, 2017