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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

Sinistrous Mistress 

A sexy, left-handed woman. Also known as a sinister sister.
She's left-handed and a little bit sinister. She's a sinistrous mistress.

sinister minister 

yo dude i brought a baggy of sinister minister

yeah cheers
sinister minister by Superhanzz January 2, 2011

sinistrophobia 

is the fear of all things to the Left.
a-"quick! look at that ball on your left!"
b-"i cant, i have sinistrophobia!"

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

Sinistar 

A mid-1980s arcade game where you pilot a ship through an asteroid field mining for bombs to use against a super-demonic space robot called Sinistar, which is being built by swarming drones and defended by fast-firing tanks. Once Sinistar's construction is completed, he starts threatening and taunting you ("Run, Coward!") and makes a beeline to your sorry hide. The stress level involved gets ridiculously high. It is/was quite possibly the toughest arcade game in human history.
Beware, I live.
I hunger.
AAAAAAAURRRRRRRRGGHHHAAAAAAA!!!
Sinistar by Paul Wartenberg December 10, 2003