Top Definition
Ruthless, but in an extremely cool way. Possessing qualities similar to the Sith in George Lucas' Star Wars film(s).
"WTF?! Samir just knocked that guy out with his limo door!"

<lol> "Damn, that fool is Sithcore."

"Hey, you check out the new KOTOR beta?"

"Yeah, that shit's Sithcore."
by Darth Sarcasmus February 03, 2010
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