A person or a living creature that might be as smart as a tree thump. It is used as an insult when they do something incredibly retarded or dumb.
Why are you such a dumbass?
You are such a fucking dumbass.
You fucking dumbass, literally anyone can make a definition here. To cite urban dictionary as a valid way to define words is just utter stupidity
John: Hey bro, I just bought a new NFT!
Bob: Why would you do that you dumbass
Idiots like u looking up dumbass in the dictionary are dumbasses
Don't be a dumbass
What your girlfriend is. In other words, the love of your life.