dumb-ass AmE
dumbass AmE
stupid-ass AmE

"Yeah, man, we sure pulled one on that dumb ass."

What kind of dumb ass were they dealing with here?

They had no idea that woman was smarter than a whole unit of dumb asses.

What a dumb ass; I could have killed myself!

Most of the dumb asses down there want to do this magic disappearing act.

Or so says the dumb ass at the front desk.

But they are ignorant and stupid like the dumb ass.

I am 50 years old and I can see better than these dumb asses.

He's going to tell me his great white hope's a dumb ass.

"The kid could bleed to death by the time you get your dumb ass there!"