What does Narc mean?
Originally referred to "narcotics officers", but is now used to denote anyone who is there to snitch.
Other definitions of Narc:
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How to use the term Narc:
You're going to tell on me? You're such a narc.
More slang terms:
rolling on the floor laughing
Oxford English Dictionary
Means fun, cool, happening, or hot. Also see Qrackling