sister fister

Anyone who has shoved their hand into a friend's sister's cunt

1) WOW I PULLED THE SISTER FISTER ON STEPH
2) I pulled the sister fister on blakes sister

sister fister by Zane April 4, 2003

ur sister fister 

Stronged then any of the ur mom gay insults

Person 1 : ur mom gay

Person 2 : ur dad lesbian

Person 3 : Ur granny Tranny

You : ur sister fister

*world melts and universe explodes*

ur sister fister by Zygno April 4, 2018

sister fister

The act of fisting your sister. Commonly refered to as incest.

Yo this kid named Nicholas O. is a fucking sister fister!!

sister fister by Dankolas O. January 25, 2016

Sister fister resister

Someone who is against pewdiepies "sister fister"

"The sister fister resister club is protesting for it to be the 'brister fister'"

Sister fister resister by Save.meeee.boii August 21, 2017

Sister Fister

A person who fists peoples sister

amr fisted my dog

Sister Fister by me March 1, 2004

sistersister 

really cool actrises

twins

sistersister by joanna July 2, 2003

sistersister 

when two girls say the same thing at the very same moment.

person 1:person2:"god"

sistersister by xtyne February 6, 2003