Acronym for Gay Man Handjob. Based on the theory that gay men know better how to please a man with a handjob as they have experience with male genitalia and its complexities where women do not. This highly prized commodity can be used as a unit for trade or barter among hetero or homosexual males.
1. "I'll give you three GMHJ's for a slice of your pizza"
2. Roomie 1: I'm out of laundry detergent, can I use some of yours?
Roomie 2: What's in it for me?
Roomie 1: A GMHJ.
Roomie 2: Have at it.