A clumsy, uncoordinated dumbass who can't do ANYTHING right. The equivalent of a fuck-up.
Urkel is an example of a bungler, tripping over everything, before he became Stefan and shit.
Someone who believes what they read on the internet, no matter how far fetched and out of the world the pitch is.
Man I just read Bungler News , can you believe that George Bush never finished the third grade?