Assing it up

The act of going over to someone's house and dropping some serious deuces. Can also be when you go to someone's house and rip a couple.

Damn, Mark is having a party. I'm gonna go to his house and ass it up in that motherfucker.

by Uncle Funkalunkel October 15, 2003

assin' it up

Acting in a manner consistent with an ass (either a jackass or just an ass ass). Braying arrogantly and assishly. Producing excrement when one acts or speaks. See Donald Trump.

"I see Trump was on Twitter again in the wee hours, assin' it up!"

by SusieSweetCheeks November 17, 2016