Top Definition
a/c
Air conditioning, something that people in hot places love and worship.
Where would we be without a/c?
by I'mAnonymous April 27, 2008

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A/C
(verb) It means to relax. You say it to people to de-stress and unwind. It can be used interchangeably with "take a chill pill" or "take a load off" Or if a conversation is too heated and it needs to be cooled down, people will say "A/C!"
steve: WOAH! STFU! YOU'RE STUPID AND ARROGANT!
ben: NO, YOU'RE SUCH A BITCH FOR EVEN CARING!
mark: you guys, A/C. A/C.
by Bonnie L June 12, 2010

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a/c
Acronym for "Ash Catcher"
Diffused downstem, RooR A/C and RooR Custom Bowl.
by Cpt Cannabis October 14, 2009

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a/c
Shorthand for account
Capital account - cptl a/c
by Kung-Fu Jesus May 06, 2004

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a/c
short for "Aircraft"
Person 1: Man, what a/c did you go on, LHR-JFK?
Person 2: Dude, it was this sweet 772! It was totally at MTOW!
by AnonymousPerson555 January 17, 2007

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A/C
A/C or "Appearance Cosmetic"

A group of 10 to 15 year old boys on Honda-Tech that aspire to own pink and orange Japanese economy cars and 48" chrome "spinna" rims. Additionally, there are also a disproportionately large group of 20-somethings that feel painting and applying decals and wings to a used Japanese car is quite possibly the best way to pick up a new "baby momma" after the old one has sold her body for crack.
Yo dawg! You see that fresh Civic in A/C? It had a mad tyte fishtank in it! R0TA 4 LYFE!
by Francis6758 January 30, 2007

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