Cop

(Noun)

1. Someone who talks shit about people behind their back, but acts entirely normal and/or friendly towards those people. Similar to how an undercover cop would act around people they plan to bust.

2. Someone who is naturally two-faced, but is completely oblivious to it.

Similar to:
- narc
- snitch

PERSON 1: So Joey was talking shit about you behind your back.
PERSON 2: I could see that. He was saying some shit about you a couple days ago too.
PERSON 3: Yeah Joey's a total cop. Someone should tell him.