A person who grabs ass and runs away, much like a pirate with booty.
Geez Josh, you're such a butt pirate tonight.
Someone who goes full sail at the sight of booty. Can be used as straight or gay, depending on context.
Jimmy is such a butt pirate! He's always gazing onto football players.
When you sit on someones head and rip ass on their head.
We were sitting in gym and Charles pulled a Butt Pirate on me. I smelled like a fart all day long.
Someone who announces he has poop on his dick in public after rounding out a limpy wristed fag.
Gee, why does that butt pirate smell like shit.
Do you think he's a pirate's night kind of white boy? Looks like it.
When you are having sex with a girl doggy style, spit on her back, then when she turns around you blow your load in one eye, and kick her in the shin and let her hop around on one leg, holding her eye.
Person 1-"Oh man Sarah's angry at me."
Person 2-"Why's that?"
Person 1-"Ah i did a one eyed, one legged pirate to her, it was funny though, watching her hop around like that!"
Someone who stops your workout in the gym or elsewhere
I hate that guy, stealing dumbells, damn gain pirate