1. rude slang Extremely and irritatingly stupid or foolish. Used before a noun. I really wish you'd give it a rest with those stupid-ass comments. You wouldn't have to ask if you just read the book like everyone else! I just don't see why everyone likes this movie. It's visuals are dull, the characters are all one-dimensional, and it has a stupid-ass plot that goes nowhere!

2. rude slang Very annoying, aggravating, or infuriating. Used before a noun. Oh, for God's sake—this stupid-ass computer crashed on me again! I'm so sick of this stupid-ass class! I just want to be done with it already!