twisted sister 

the 80s band twisted sister ROCK!!!! they made the song "Where not gonna take it" which is still popular today....

twisted sister are one of the best heavy metal bands from the 80s apart from metallica before they became sell outs with st. anger

twisted sister by feel the nosie July 25, 2003

Brain Sister

A "Brain Sister" is a girl who wears glasses and finished high school. However, there is some debate as to whether or not a "Brain Sister" actually wears glasses.

"She was only twentyseventeen, she was a lonely beauty queen, she was a brain sister, Texas Instruments all day..."

Quoted from the Limozeen song "Brain Sister"

Brain Sister by Garboth March 19, 2008

play sister

The undercover love interest of a man who is engaging another woman outside his marriage or relationship. To his wife or girlfriend, this extra girl is a friend, when the truth is he and this "play sister" may have been intimate in the past, but the relationship did not work out.

She's just my play sister - there is nothing up between her and I.

play sister by vandecou December 19, 2012

scissor-sister 

The female version of a butt-buddy. Two female friends who spend time with each other in excessive amounts.

Jill and Sara spend so much time with each other that they're scissor-sister(s)!

scissor-sister by John Clarkersoner April 23, 2010

blister sister 

Someone who shows up when the real work is done then acts like they took part.

Dilbert and the intern spent days proofing the manual then Wally pulled a blister sister and ran a final spell check to claim all the work.

blister sister by billmanak February 10, 2009

the sister 

While taking your girl from behind, (HOLD ON TIGHT) tell her "Your sister does it better!"

I was fucking my wife and told her the sister was better. BEST SEX EVER

the sister by Boston Mike March 17, 2009

step sister 

The person who is always complaining about how you took her room when you moved in

my step sister hasn't stopped glaring at me since i moved in

step sister by LunaJade April 3, 2015