1. Someone who rats another out, usually regarding illegal activity.

2. A person who sleeps alot. Thus they are jokingly called "narc", short for narcoleptic: a person with the disease of narcolepsy, who as a result does not have proper control over sleeping/wakefulness.
A: "Yo, B!"
B: "zzzzzzZZZZZzzzz"
A: "...B's a fucking narc."
C: "true."
by Leilani_h June 04, 2005

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a narc is someone who tells on someone else for a wrong doing
Someone motherfucker narcked on my ass, dammit.
by CnN June 11, 2003

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To suddenly and uncontrollably fall into deep sleep. Typically in the form of a full night's rest or extended nap. Derivative of the word "narcoleptic," but not actually associated with it.
"Sorry I narced out last night in the middle of the movie; I really wanted to watch it with you."
by Jon Hoffman July 05, 2006

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UNDERCOVER police officer
person ridin in a dark blue crown vic
by juicy gold June 07, 2005

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A great arcade game which involved killing everything in sight. I think it might have had something to do with drugs. Also, the Pixies covered the theme song.
"My parents feared for my future because I thought running down crackheads with a corvette was fun."
by montez June 26, 2003

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Another name for Big D, which is another name for Matthew.
Person: "I think Big D bugged my house."
Other person: "What a narc."
by Brutus Max October 04, 2016

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Narc is a shortened form of Narcotic and may refer to hard drugs or, by extension to a police officer from the drugs squad.

NB:
This word is often confused with nark. Nark is British and Australian slang for
(i) noun: a police informer, or more widely, anyone who reports illegal or anti-social activities to any authorities.
(ii) verb: to annoy, to irritate,
"See, that guy over there? The one who looks like a druggie? He's undercover, he's a narc."

"That guy just asked me for money for a cup of coffee"
"Cup of coffee? He's a junky, he wants his narcs."
by PaulQ86 February 16, 2012

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