A term of derision that began to develop in the 1950s. A person who is held in contempt by others for making poor decisions or for being generally ignorant.
"You pus-brain! You're supposed to throw water on the fire to put it out, not gas!
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