A ROBLOX clan created by a guy named Kalavamo who didn't know any better.

The clan is now lead by a stupid guy who wants to make the clan grow.
Guy 1:Dude, I joined a clan named Nation of Sinister! They worship pumpkins!
Guy 2: Ew
by vivacapsuni May 13, 2020
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A mean looking but really harmless cowboy on Sesame Street, just like Bad Bart.

Catchphrase: "Alright, listen, you varmints. I was just over at the general store and I understand that some hombre bought the last box of crayons. But I wanna know Y".
Uh oh, everybody look here. Here comes the meanest hombre in the west, Sinister Sam.
by tyrulz August 01, 2014
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1.) When a man repeatedly returns to his ex-girlfriend/ex wife, even though he hates her, just for the sex.

2.) being pussy-whipped to a girl your friends and family hate. often friends will try to separate the victim from his assailant.
"Dude, where's Jack? He said he was gonna meet us at the bar?"
"He went back to Jill's again,"
"Looks like he's got a case of the sinister slice again. we gotta get him away from her, for good."
by LDKSparda December 21, 2009
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A FNaF fan game created by an awesome team with a very manly and awesome leader named ANGUs GAMEs who are the new people working on the new and better version of said fan game that is about special versions of animatronics called Sinister and Prototype (and maybe more) attacking a person in a theme park who is trying to figure out what's going on and who the master mind behind it all is.
Hey guess what? Sinister Turmoil. Wait that joke sucked. Wait that wasn't even a joke. Shit I suck at jokes.
by The fish nish. January 01, 2018
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A white and purple pumpkin. Good roblox modeler that loves FNaF and Homestuck.
He now owns The Frank Fanbase
Man 1: "DJ Sinister is epic"
Man 2: "yes."
by BiteIsMe October 22, 2020
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