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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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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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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Derived from shield heraldy. Sinister means from the left. A sinister gamer is a left-handed gamer.
As a sinister gamer, I tend to be more of a pc gamer than a console gamer.
by Mr. Sinister February 9, 2021
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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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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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A band that is so amazing and can literally get any chick except for the United attractive ones.
Did you see that sinister concert the lead singer is so amazing.
by Jackfresh21r May 19, 2022
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