A syndrome diagnosed to fictional characters. This syndrome identifies the villainous behavior of antagonists, anti-heroes, and other character types as the quality that makes them attractive. In simpler terms, villain bad and therefore hot.
person 1: how can you simp for that guy? he’s a murderer!

person 2: bro he’s got S.S.S. written all over him. i can’t help it.

person 1: what the hell is S.S.S.?

person 2: you don’t know what S.S.S. - Sinister Sexy Syndrome is?
by kaeyas.stepstool September 12, 2021
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sinister sally Fuck

This is when you dig up a little girls body and have dirty dirty sex with her neck.
"Dude, we stopped down to the graveyard last night and got our sinister sally fuck on".
by Big feces May 16, 2008
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Sinister Stanley

When a man marries a woman, and proceeds to perform bedroom antics with his wife's sisters, because this guy is void of any kind of moral compass, and/or is just a complete douchebag.
Girl - "I can't date that dude, he's such a Sinister Stanley!"

Girl - "Did you hear about Dave? He totally did a Sinister Stanley on his wife".

Man - "I have so much respect for Brian. He Sinister Stanley'd the shit out of his wife!".
by DirtyDave2.0 August 13, 2022
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Sinister 6

a discord groupe with more lore than star wars !
"Sinister 6 VII already " "why is muzfan in the sinister 6"
by Frightful 6 May 10, 2022
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Sinister Doily

Some one who is being rude, unattractive or obnoxious.
"Wow, did you see that guy wearing pajamas at the mall?"
"Yeah, what a sinister doily."
by Nicolioli June 15, 2007
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Sinister

Shady ass person or action.
My man's girl was coming after me behind his back, that bitch is sinister.
by Megalosdog January 04, 2020
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sinister

If somebody really is good natured, they don't invite hostility and aren't involved in hostile events/incidents/arguments often (even ones they describe to others as hilarious situations). If someone is overly argumentative and does everything to excess, they are not entirely good if they are good at all.
The dork claimed to be a good college girl, but anybody with as much to run from as she had to run from must not have been entirely good, if there was any truth to her claim of being good at all (since it was a questionable claim where evil or sinister was just as likely to be her true nature).
by The Original Agahnim December 19, 2021
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