What is muhfucker?

A stupid motherfucker.

Julia:Why did you cheat on me?!

Kris: Cause you're a STUPID muhfucker
Julia: YOUR A BITCH
Kris: FUCK YOU

muhfucker - video

Muhfucker - what is it?

The action of having sex with one's mother.

"Can I muhfuck you, mother?"
"Sure, Oedipus."