Sinistral 

An arrogant fascist with an inflated opinion of himself. Usually holds power over a chatroom or internet forum and seems to think that makes him a deity. Feels a constant need to demonstrate his supposed superiority by attempting to belittle and humiliate others. Doesn't really care about anyone but himself, and once someone stops worshipping him he will treat them like he does everyone else.

Goddamn Sinistral! Who the fuck does he think he is?!

Sinistral by Elyseon May 10, 2008

Sinistral 

A human being, that, when pissed off, has the unique ability to recite every bit of cussing from a Jerry Springer show.

When Sinistral got really pissed off, he $%#% the little mother $%#%er and $%#%ed him up his $%#%#ing $#@$# $%##%$# #%$#% #%!%@ &%^&% !$^ %^& !#@$ $5^#$^ ##%$#

Sinistral by Xelopheris March 16, 2003

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.

Sinistrous Mistress by yo-yo-ma-ma March 22, 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!"

sinistrophobia by iheartmarie May 29, 2010

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

sinistro

'Sinistro' is a carioca's slang that could means st. cool or st. really bad. It depends on the emphasis.

ex.: Man, the party last night was 'sinistro'. (cool)

ex.: So, it seems the accident was 'sinistro'. (terrible)

sinistro by Antonio Proenca March 18, 2007

Sinestra

a person who is at once beautiful and fearsome. Often used to describe Dominatrixes, particularly Drag-Queen dominatrixes

oh my good, she's beautiful, but scary, she's the full Sinestra

Sinestra by Sinestra October 16, 2015