Originally meaning something thought to be true now proven false, it is now used as another way to say uncool or lame, but when self-proclaimed debunked, it is understood that you are the cool kind of loser. When someone is sexually debunked, they are very inexperienced and expected to remain that way for a long period of time.
Did you just trip over your own feet?
Eh, I'm debunked, that's just how I roll
That kid is such a nerd!
Yeah, he's so debunked he's never gonna get laid.