A kid who always refers to his own inside jokes and phrases, as well as speaking gibberish frequently. Klopper is generally humorous and very entertaining to be around.
Me: Haha, look at that over there!
Klopper: Haha, hey bow it's Nigel, bic wan, zoob, yallah habibi *random noises*
Me: Uh, ok then, Klopper Kebab
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