A pompous ass that proclaims he can do something, which far exceeds any capabilities he really has. This usually occurs in a person who has an inflated ego and has been drinking heavily. When he attempts to backup his talk, he fails miserably and is a complete embarrassment.
Oh, you need someone on your team for beach volleyball? The rest of these guys suck. I could've been on the Olympic team if I wanted, so it's pretty obvious that you should choose me. I'm your "Best Option"!