1. One who mongs dongs.
2. A person who is known to be an annoyance to a particular group of friends, who secretly dislike said person.
3. Less used insult similiar to "dick-head."
"I wishbob would piss off."
"Yeah, he's a dongmonger."
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi