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This is slang that originated with American soldiers during World War II. Many US troops were armed with their fully automatic equivalent of the STEN gun, the M3 submachine gun which, because of its resemblance to the mechanic’s tool was called the ‘grease gun’. With the slightly macabre humour prevalent amongst those who are in combat, enemy troops killed by this weapon were referred to as having been ‘greased’.
It quickly came to mean killed by multiple bullet wounds from any type of machine gun. It was during the Vietnam War, however, that its use expanded and increased quite dramatically until it became used to describe any death in action against the enemy.
There is now some evidence to suggest that the word greased is being used to describe any violent death, even where this is not in combat and when it may even be an accident.
“Tommy got greased yesterday! Fucking great pallet of bricks fell on him at the building site!”
by AKACroatalin October 16, 2016
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To be greased means to be killed. Originally it meant to be killed by multiple bullet wounds from a weapon fired on full automatic but gradually its use extended, particularly during the Vietnam War, until it was used to describe any death caused by enemy action.

The expression originated from American troops of the Second World War who were armed with the M3 submachine gun. Since the M3's nickname was 'grease gun', supposedly from its resemblance to the mechanics tool, enemy troops killed by the M3 were soon referred to as having been greased.
Had some luck out in the boonies today!
How's that?
Nine of Uncle Ho's finest goofin' off in a waterhole, twelve M16s greased their asses real good!
Number One!
by Croatalin November 19, 2013
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The state of being completely obliterated by alcohol.
Look at Corey overthere, he is just greased
by Anonymous September 12, 2003
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When you are in a situation that is unfortunate, hard to get out of, or a situation when you are taken advantage of. Exactly the same as getting screwed, shafted, or fucked over. This term is more popular in Canada than the United States.

Related to: Greasy, Greasing, Grease
Person 1: "Hey man I just talked to that guy from the car dealership, and he said I can't have my deposit back"

Person 2: "Yeah man, sounds like he Greased you"
by BillyDaYak September 02, 2018
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ambushed by a spray of lead count the bullet holes in your head. Verb meaning to be severely injured or killed by a spray of bullets from an automatic weapon. See also GREASE for the origin of the word
I snuck up behind that fucking camper and greased him good with my UMP-45.
by Spanky McSpunk April 15, 2003
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to have played, have been played, or made a mistake. (i.e. "caught a grease" "been greased")
when getting a rejection by a girl in a proposal, you've been greased....or when you find out your girl/man was datin your best friend, you've caught a grease....or when you start slippin and get caught in the act, you've greased...or you spontaneously go to the club thinkin its free and you gotta pay $50 or buy a bottle to get in, you've greased....and many many more circumstances
by Bird827 August 01, 2007
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