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8.
1. A Narcotics officer.

2. A tattle-tale, someone who would tell parents/boss/police/authority figure/the man about a misdeed.

3. Someone who hates care-free fun, usually a similar type of person to 2. Will often rain on your parade with facts about the environment when you get a new car. Will complain about practical jokes being mean, or play devil's advocate when it is unecessary or nearly impossible.

4. A person who is short tempered or irratable. Will often shout at you for being on their lawn.
I think that guy might be a Narc, you should hide your stash.

God, Phil, you're such a narc. I can't believe you told the teacher I threw the paper.

Stop being such a fucking narc, Sim. You can't outrun a bear and child abuse IS wrong.

Calm down, you've turned into such a narc lately.
by The Nerd King February 19, 2008
 
9.
narc is short for narcotics officer. It is used to refer to someone who tells a figure of authority about drug use.

To narc is the action of telling an authority figure about drug use.
Johnny fuckin narced on me and the cops took all my herb.

Muthafuckin narc!
by Fatass December 23, 2004
 
10.
a tattle tale, a killjoy
John told the teacher I cheated, what a narc!
by Alishizzle December 21, 2006
 
11.
The crevasse in which your butt hair turns into your thigh hair.
Guy#1: Man, my N.A.R.C. is soooo sweaty!
Guy#2: Are you serious? After my N.A.R.C. piercing, mines infected.
by MVZ689 June 06, 2009
 
12.
1) A snitch, narcotics officer, popo, or fucking pussy.
Matt is such a narc.
by cridizzleforizzle May 29, 2006
 
13.
an undercover pig who tries to bust ppl for using drugs
by ash October 28, 2003
 
14.
a name for someone whose a snitch.
yo ryan told on connor again for looking at porn. what a narc.
by l-nice July 01, 2006