Top Definition
A Psychotic person. Short for lunatic.
Damn that guy was chewing on his finger because he thought it was a peice of chicken. What a fucking LOON!
by Delta9 March 01, 2005

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In Aberdeen, Scotland, it's local dialect (doric) meaning a young guy. That's probably why there's another definition further up, for fans of the Scottish actor Billy Boyd. Whose not from Aberdeen I think but never mind.
"Aye, d'ye ken that loon fae two doors up?"
by loon July 02, 2004

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A crazy, psychotic person who doesn't care a.k.a nutter]
C you are a proper loon
by Loopyloulou September 11, 2006

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noun
1 a large North American bird that eats fish
2 =LOONY
3 a rapper who belongs to Badboy Record
by obie September 11, 2003

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Crazy mofo's. Psychotics. Loonies.
Damn i went to a party last night and saw some guy get his throat sliced by a couple of Loons.
by Delta9 March 01, 2005

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Shortened version of the Canadian word 'loonie' which means a one Canadian dollar coin which has a loon (bird) on one side. It is equivalent to UK 'Quid'
I got ten loons in me pocket.
by Canadianhero September 03, 2012

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Pants, short for Pantaloons.
I bought me some new loons today.
by HipJThrilla July 22, 2009

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