Impenetrable, incomprehensible, gibberish, utterly foreign, incapable of being understood.

This is the more traditional, colloquial meaning in American slang. Something, usually text or a learned subject, that is difficult to comprehend or understand.
"I am trying to learn calculus, but failing miserably. It's all Greek to me."

"Can you read what it says on the menu? It's all greek to me."
by david lincoln brooks November 5, 2017
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A person who is extremely cool and smooth with everything he does. Also likes to get geeked and is a freak.
"Greek motherfucker, your the coolest mother fucker on the planet, dude"
by geekedgreek August 18, 2006
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Will this be a QV Greek
by October 6, 2021
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One who owns all. Usually have at least 27 cousins, eat lots of awesome food (Yamista, gyros, spanicopita). We invented everything, including the atom bomb. It was then stolen by the Italians, then by the Russians, and finally by the Bastards in the USA. We hate those malakas from Turkey, with their camel wrestling. They take over northern Cyprus, so we are forced to kill them.
by Spatter Artist (Ioannis Tzilos) February 19, 2006
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If you have no intention of going Geek I mean Greek do not go here.
Party Invite; Greeks or Girls
by nyferr1 August 28, 2008
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A lazy person who wants holidays, likes to talk bla bla, and goes to buzukia to get drunk.
Person1: I'm Greek.
Person2: I'm so sorry!
by totally irrelevant January 31, 2008
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disrespectful slang for lavaliered; usually used by low level practioners of lavaliering who are not in a fraternity.
"Hey dude I greeked this chick last night and she was SO PISSED. Hahaha. Good thing I didn't spend too much on her."
by Elric21 March 14, 2012
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