Sinisister 

A rotten older sister.

Person 1: My older sister made fun of me today
Person 2: Well what do you expect she's a sinisister

Sinisister by youngersibling1111 May 4, 2010

sinister slash 

When you rip open the vagina with two hands so wide you can crawl inside.

I will sinister slash your girlfriend.

sinister slash by Superslickwillyg January 24, 2014

sinister minister 

weed, ganja

yo dude i brought a baggy of sinister minister

yeah cheers

sinister minister by Superhanzz January 2, 2011

Sinister Sister 

A sexy, left-handed woman. Also known as a sinistrous misstress.

The English word sinister comes from the Latin word "sinistre", meaning "left". So, since she's sexy and left-handed, she's a sinister sister.

Sinister Sister by yo-yo-ma-ma March 22, 2011

Sinister Edge 

One who perceives himself to be like Frank Sinatra. Drinks, smokes, and gets women.
Also know as being the opposite of straight-edge.

So I have heard of a straight-edge life style. But wow, you surely live your life Sinister Edge!

Sinister Edge by moody316 March 24, 2009

Sinister Finister 

A one downin' fool you might encounter at your friend's mamma's house. Usually found lookin for purple stuff in the fridge on his way down to the basement where he might try to play uriah heep bass lines and poke holes in your rubbers.

Dude, if you can't already tell from the easy livin' riff, sinister finister is downstairs. I think he broke your dad's treadmill and oh yeah, you might want to double wrap your pickle if stacey is comin' over later.

Sinister Finister by biddy-b January 21, 2005

sinister strike 

A noob attack in World of Warcraft that only noob subtlety rogues would use in order to waste more energy instead of using hemorrhage. However, it is a vital skill for combat and assassination rogues because it is about the only attack that they can spam in order to gain combo points. Some combat rogues also prefer sinister strike with improve sinister strike talent.

rogues typical chain combo
sap - cheap shot - Sinister strike - Sinister strike - kidney
Sub rogues
sap - ambush - hemo - hemo - kidney
(or something like that)

sinister strike by Noob rogue December 21, 2008