your sister

The person all your guy friends want to fuck when they realize she isn't just yur little sister any more- she's your little virgin sister who is hot now that she has boobs and shaves her legs.

"Damn! Your sister is hot! When did that happen!?!?"
"Dude as your best friend, would it be weird if I fucked your sister?"

by Sexy Stephy June 6, 2004

Sister-In-Law

1. Your Husband's, Brother's Wife

2. The annoying bitch who thinks she has been in the family longer, so she can command the family to do what she wants.

3. The Family Manipulator

4. The Bitch that won't be at my wedding.

*Your* sister-in-law will NOT be at our wedding, because that bitch does not know how to shut her mouth.

by Fucking Cunt Whore Bags January 29, 2009

sister fister

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

Yo this kid named Francis is a fucking sister fister.

by Quay and Justin October 29, 2003

sister ray

A Velvet Underground song off their album White Light/White Heat that is the loudest most distorted bizarre unwholesome 17 minutes of music ever created.

I couldnt hit it sideways...Just like Sister Ray said.

by searchin for my mainline December 28, 2005

Hilton sisters

Ugly anorexic douchebags that spend their money foolishly and only live to pose in front of the cameras.

Need to die

by Mike P December 3, 2003

brain sister

An attractive twenty-something year old who is constantly occupied with a Texas Instruments calculator.

"She was a brain sister - texas instruments all day"
-"Brain Sister" by Limozeen

by Daniel C. Johnston July 31, 2006

Weak Sister

1. A weak or undependable member of a group. 2. A person regarded as timid or indecisive.

Jim's a fuckin' weak sister, he couldn't decide whether to shit or go blind.

by zboss July 5, 2007