a way to say shut up when you are bored. you say it with a flattone. also, for people who are picky about language, you say shupup and they cant consider it a bad word cause it isnt. another thing is if someone is really bothering you, you say shupup noob, drawing out the noob.
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