An insult used to describe someone who is dumb, or generallyincompetent at something. Often used by people who couldn’t think for anything better, i.e. middle school boys.
Mmm. Just the right insult, not too much to get your ass beat, but just enough to get the point across that whoever you called a bozo, is a bozo. It's got just the right umph and pizzaz to make them give you the rock eyebrow when you call them this.