1. A type of person who enjoys "getting off" young girls, hence, G-Off.
2. A type of body odor that can knock out a rhyno. As you guessed, this may be a turn off to the girls; hence, G-Off.
A particularly shiny being that (most likely) excretes his own grease at an alarmingly quick rate. May or may not also be drenched in an overwhelming amount of bodyspray.
Man, that Y2M could probably wax his car with his face!