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A frister serves both as a friend and a sister. This word is most commonly used between twins, for they are usually incredibly close and are both friends and sisters. A frister is the ultimate companion who you may share inside jokes with, make lunches for, and watch ridiculous movies with.
Hey frister lets go catch an uber ridiculous movie, I'll make you a nice lunch with a home made granola bar in it.
Frister by Shananigans333 April 6, 2009
Related Words

Twisted Fister 

The ultimate name for an 80s hair metal cover band.
If it were Twisted Fister on the radio, I wouldn't hate that goddamn Train song so much.

Foistered 

Donald Trump made up word during the 2019 rally in Tupelo, Mississippi.
First, they engineered the Russia hoax. The single greatest lies ever foistered upon the American people.
Foistered by TraderShocker November 7, 2019

Super Double Fister 

The action of folding ones hands together and then fisting a vagina or anus at a high rate of speed. Typically crisco is applied to the forearms and fists. If you are a jilted lover perhaps you will give your partner an ungreased super double fister.
Dude, the other night Stevie D and his new girlfriend gave each other super double fisters - I heard the girlfriend gave stevie an ungreased super double fister. Man, his anus must lbe the size of a peanut butter jar.
One of the only 4 actual jobs in the army. Nomenclature: 13F
Fire Support Specialist
Hell Yeah!!! I'm a Fister!!!!
Fister by wildcardman October 15, 2010

sister fister

The act of fisting your sister. Commonly refered to as incest.
Yo this kid named Francis is a fucking sister fister.
sister fister by Quay and Justin October 29, 2003