When one's partner squeezes out a turd while one is actively engaged in anal intercourse so that one's penis happens to divide said turd much in the same way that one splits a log of wood.
Sally wasn't too keen on log splitting but I reassured her that I didn't mind getting a brown dick.
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