It isn't a RAT.
Money Heist Season 3, Episode 4
Danny, you RAT bastard.
The Big Bang Theory Season 12, Episode 17
What, you think
I'd partner with a RAT?
Breaking Bad Season 5, Episode 16
Not so bitey
without the rest of the RAT
The Big Bang Theory Season 7, Episode 13
What RAT have you recruited
to the S.S. Sinking Ship?
The Big Bang Theory Season 1, Episode 13