Acronym for I Pulled It Directly Out Of My Ass. Used frequently in the businessworld (OK, maybe not so frequently). Indicates that little thought went into providing an answer, etc. Similar to swag, Scientific Wild Ass Guess.
Boss: "This estimate is way off, how did you come up with it?"
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