A Eye
If you're not a brainless moron, you'd know that 'eye for an eye' means if you mess someone up, we're messin' you up too. Hammurabi said it first, but he probably used worse words.
You broke my nose? I'm breakin' yours.
She pulled my hair? I'm pullin' hers.
He called me a f***ing idiot? I'm callin' him a f***ing moron.