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
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Zoey from Grownish: Cash is messing with Zoe Kravitz and he didn’t tell me?!?

Me: Zoey everything ain’t about you. Don’t be such a narc.
by IT'STHATSWAGMONEYBITCH July 23, 2018
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"like they plant narcs in schools!" someone shouted.
by Morgan Tierney October 31, 2006
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Someone who rats people out to others to lessen their own punishment.
Person 1: Dude you said we could smoke here and it would be cool.
Person 2: I didn't think it would smell like skunk.
Person 1: You fucked us over you narc.
Person 3: Fuck you Logan.
by Slayer Duncan May 25, 2008
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He is a narc, all about himself, no empathy for others.
by Sam688 December 31, 2011
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Short abbreviation for "narcissist", which means conceited, self-obsessed, bigheaded.
...also a very good Interpol song
Johnny is such a Narc, all he thinks about is himself.
by Meeneh December 27, 2005
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an undercover pig who tries to bust ppl for using drugs
by ash October 28, 2003
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