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1.
Someone who listens to butt rock. They usually have big long hair or a mullet and wear rock t-shirts and jeans.
That butt rocker over there is listening to Def Leppard.
by Jack Batemaster January 07, 2004
 
2.
Someone who wears acid-washed or razor shredded jeans, sometimes sports a mullet, other times sports greasy ass hair. You will find them flashing devil horn signs while listening to Nelson ("(Can't Live Without Your) Love and Affection").
"Dude, you're dating a total butt rocker!

"Dude, what's a butt rocker? Is that someone that takes it from the back?" says the east coast chick.

by Taco Churrito November 06, 2005
 
3.
A tattoo on a womans lower back above har butt.
Damn, that is one sexy butt rocker on that bitch!
by Johnny Tats October 13, 2007