look up any word, like blumpkin:
 
1.
A girl that looks like a man.

A girl that talks like a man.

A girl with a square chin and facial hair.

A stupid fuck of a girl that wears mens sports clothing and a baseball cap.

An ugly girl.

All/Any of the above.
Man A: Geez, you want to stop fucking that Kappa track suit wearing geezer of a mush bird.

Man B: She loves it hard up the shitter though...

Man A: You knoes iiit...
 
2.
A pretty fucking butch lady.
Man 1: Damn. She's got more testosterone than the entire football team.
Man 2: Yeah, she's a fucking mush bird alright.
by Itchy nutsack May 29, 2006