Jim's wife became concerned by his frequent urination and weakejaculation, so she made him see a urologist who, after aggressively fondling his family jewels and finger blasting his poop chute, wrote him a prescription for Avodart and sent him home sore and traumatized.
A complete dumbass in every sense of the word, making a complete fool of oneself each time one speaks. An idiot. Often accused of having piss for brains, hence the term.
"Who's he? A urologist?" "Yeah, he has piss for brains."
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