A horse job is a sexual move done to either a girl or a guy. When a person is going down on another person, the person pleasuring does a motorboat move with their lips while exhaling loudly. This, of course, simulates a horse naaying. Thus a horse job.
Nic: Hey DJ! My girlfriend is out of town and I want a horse job really bad. Will you give me one.
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