When a guy puts a metal sheath on his dick and makes a new hole between a chick's vagina and asshole, then leaves the sheath in there for later use. Also good for robot style sex.
"Eric is such a progressive thinker. Last night he gave me the ol' omnitron unicorn and I was sitting pretty."
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