Used to explain one who constantly criticizes and berates others to tear down all sense of their self esteem and ego for the sole purpose of raising ones own entertainment.
"Did you see Carl make fun of that kid; he was defenseless."
"Yeah, Carl was really showing his dedeness."
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