When a girl has large dimple like indentations on her lower back directly above her butt. This results in a sometimes sexy, strange occurance called the back butt.
"Damn, I don't know wether to be turned on or throw up at the sight of Lexxy's back butt."
"I hate summer. I don't like to show off my back butt. Seriously, aren't dimples supposed to be on your face?"
When a gym rat flexes his back muscles giving off the appearance of a butt crack
Colin is such a frat star flexing his back butt.
an attractive luscious female ass
"woohoo hey baby back that butt up!"
a dirty slut who sneaks around in back alleys gettin her butt sex on
That back alley butt slut that me poke her in the brown out behind the liquor shop.
a woman who lets taking off her slippers and bending over for the biggest cock to take up the arse
christina is def into back alley butt sex