A: Someone who has enormous butt.
B: Someone, usually a gay male, who enjoys putting children's toys in their butt.
C: Wet, dirty, hairy armpits.
A: Yo dawg, you seen Latreesha since she gained weight? That bitch gots a bronto butt!
B: Nurse: I didn't go to nursing school so that every full moon all these faggoty ass bronto butts come in and I've got to pull action figures out of their ass!
C: Damn! That wench's armpit's be lookin' like a bronto butt every time she lift her arm. Smells like one too.
When your ass fucking a girl doggy style, you suddenly grab her hips and bury yourself deep in her butt and loudly call out your old girlfriend’s name, and as the pissed off girl tries to buck you off you hold on and let out your best cowboy yell and scream “Yippie Kai Yea!!”
“So why is Billy walking funny today!” “Poor guy got kicked hard in the nuts while bronco fucking Emily last night.”