After that long night on the town and that late night burrito, that hiney heaving has come on strong.
To have sex in the butt.
"Hey man, I chopped that Hiney last night."
"Awesome, yo"
"I love to chop hiney"
What you would call someone or, more specifically, someone's bum when they have a loud, rumbling passing of gas.
Oh my god, did you just fart? I felt that hiney trumpet over here!
Dude, seriously? You're a damn hiney trumpet!