What the fuck are you?

A rude imply someone is not a human.
Variant of who the fuck are you?

Someone: *acting like a debil.*
Me: What the fuck are you?

What the fuck did you just say about me?

The infamous start of the Gorilla Warfare rant.

Jax, your face looks like an elephant.

Jax: What the fuck did you just say about me?

HEY HEY HEY! DON'T START THE GORILLA WARFARE RANT AGAIN! I CAN'T STAND IT