Someone snitching to a type of authority.

To annoy or irritate someone - often used in the past tense, narked

a muthafukin cop who pretends to b down, until s/he busts ur ass 4 doin sumthin illegal

someone who tells or rats u out

When someone is or acts like a platypus.

one who reports to the authorities; tattle tail; synonymous to ALEE

A narcontics officer. Usally working under cover to bust drug users and dealers.