1. A person who, while under the influence, makes a complete fool of himself while attempting humor. An assclown may wear an asshat
2. A person who, while making a serious attempt as something, fails to realize what a complete fool he has made of himself.
3. An untalented schmuck.
1. That assclown thought he was being funny when he pretended to choke at the party, but everyone thought he was just being foolish.
2. The actor, while in character, made such an assclown of himself during the production that most of the audience started to talk during his monologues.
3. That assclown can't play the guitar at all.