(Noun.)
Shenanigaster, one who makes shenanigans, specializes in shenanigans, or overall is just a fucking wild card.
Bill: Oh man, that Mark. He put gum in the principal’s Toupee!
Steve: Oh, yeah, He’s a professional Shenanigaster. He’s got a bit of a history.
The type of ass wipe to waste your time for about a half an hour fucking up the most simple task, and would rather fuck the entire situation up instead of allow you to help, and then tell you to fuck off when you try to settle up an offer they proposed. A fuckboy of the highest proportions of clownery, and buster-ass hijinkery, with no regard for others.
Absolutely CAN-NOT hang to the point where they get cease-and-decist letters from the locals to vacate their hood.
"That guy star is an absolute buster. Is there a perfect word to say his behavior is nothing but fuckboyish buster-ass clownery?"
"Yeah, he's a shenanigast."