When somebody "loses" their reason and commits or performs an act of lunacy and or violence usually only seen on the classic cartoon series of the same name.
Dave went "looneytunes" when that guy looked at his girlfriend!
by Stephen Forster March 11, 2005

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old style cartoons that date back from 1930's to 1960. Directiors include charles m jones, frank tashlin, friz feling, robert mckimson, and bob clampet. Best cartoons ever
I watch my looney tunes dvd at leaset every week.
by jedimasterjohnjr December 04, 2005

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The granddaddy UBER-PIMP of all cartoons. It is tied with Pingu.
Watch them. It is without a doubt the biggest cartoon series ever and the funniest!!!
by Psydon September 14, 2004

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Used to describe extremely shitty music.
(In a car)

Woman : Lets see whats playing on the radio.

(turns on radio)

Radio plays a beyonce hit single: I can feel your halo halo halo!!
I can see your halo halo halo ouuuu!!!

Man: AHHHH!! Turn off that shit please!! Please!! Thats some looney tunes right there!
by ZCMC April 01, 2009

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Acting beyond crazy.
Chugz: What's all the fuzz about Rah dog?
Shanker: His friend K-man was literally on fire, and he tried to put it out the fire with a screwdriver....
Chugz: That's Looney tunes for ya!
by The Real Chugz July 09, 2009

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Used in describing someone who is clearly sillly, crazy, or wierd.
"Why is Doug digging around in the trash dumpster?"

"He's looney tunes; he thinks he lost his New Kids on the Block CD in there."
by jason112233 September 02, 2007

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As in a mad tune; good music.
Person A: Have you heard 'Hurt You' by Chase & Status?
Person B: Yes blud, it be a looney tune.
by Kranjcar19 March 18, 2009

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