Look, I hope you're not waiting for an
apology because I did not RAT you out.
Breaking Bad Season 3, Episode 12
And it's not a RAT, it's a rabbit.
The Big Bang Theory Season 9, Episode 15
However, if you stay outside,
hidden like a RAT,
Money Heist Season 3, Episode 2
Danny, you RAT bastard.
The Big Bang Theory Season 12, Episode 17
White Rat, Your Grace.
Game of Thrones Season 5, Episode 1