A person not fit to walk through the front door of your home because they are too embarrassing to claim even in your own house. They usually have more confidence than they deserve to have. This person thinks that they are the real thing and that you actually take them seriously- they are mistaken.
Example 1 :
Person A:Why don't you hold hands with your bf/gf in the mall?
Person B: Because that is embarrassing, that is a busted boo!
Example 2:Eww, that look at that ugly boy over there, he is a busted boo!
This is achieved when the inner labia (typically of a fat woman) sticks out to the side and looks like a uvula. It is especially common for the accompanying odor to be the worst thing you will ever smell in a thousand lifetimes.
"I figured I'd take that whore to a cheap motel, but when she took her pants off my eyes started to sting so I got the hell out of there because I was pretty sure I was in for a busted-out puss flap."