Unwashed, dirty. Often hair.
"Kurt Cobain often had greasy hair."
by Dead Deer June 20, 2005

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Purposely spoiling someone else's easy shot in a game of pool INSTEAD of taking a shot at your own ball.
The eight ball was right in front of the pocket, so Fred was greasy and knocked it out of the way so I wouldn't be able to get it in for the win.
by Chips949 February 28, 2008

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to get at in a foul manner; disrespectful,scandelous or shaddy
Dude just got hella greasy with me!
Dang that's greasy! (After someone has said somethiing rude)
You gettin' greasy?
by MichaelMonet April 25, 2007

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some girls who dont know how to take showers and their hair is stuck to their face. sometimes smells like fish.
christine has greasy hair.
by william wright January 27, 2008

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aussie slang;

1. the american version of cool, tight, rad, amazing

2. (grease) can also mean to leave or go
1. good day, Mate. you know that new chap john? Mates pretty greasy.

2. Hey, this party sucks lets grease off.
by Sam Mason December 18, 2007

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When someone is dirty (not so hygeinic) and/or can be used to say someone is a jerk, who shouldn't be trusted.
"He is not invited. He's greasy as hell"
by hannah13 October 02, 2007

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Adjective (negative). Used to describe any activity that involves spending too much money, drinking too much, doing too many drugs, hanging out with dregs of society people, and generally any activity that involves lowering one's standard and hindering one's progress.

"A greasy night out" - a night out that involves enormous expense and negative health consequences but very little pleasure as compensation. Typically occuring in London (because it's so expensive and overcrowded) a greasy night out would involve leaving the office at 6, downing 10 pints of Stella, spending fortunes on cabs to go to crap clubs where you queue outside for hours, then buy more overpriced drinks inside, stagger outside, may or may not visit a kebab house or a whore house, then get more expensive cabs home, and wake up in the morning to find you've lost you brand new Armani overcoat.

Can also be applied to other situations, such as greasy mates (one's friends who encourage the above, but have no means to pay for it so you must pay for them aswell. They act as a kind of grease multiplier).
What's the matter Andrew; why's your face green and you're so miserable?

Had a greasy night out last night in Oxford Street. It was filth. My greasy mates scabbed drinks off me all night and I had to pay for the cab.
by Mikee T October 06, 2006

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a black person. a nigger.
"that was such a greasy party... we had to be the only two crackers there"
by oliver close-off November 05, 2007

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