A term used in pornography to describe when an actor holding sperm in their mouth will bend over to spit the contents into either their vagina or anus.
Actor: You want me to swallow his cum?
Director: No, it said on your CV you can do ribpies?
Actor: It will cost extra but yes.
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