1. (verb) To stick your hand into someone's pants, give them an orgasm with the hand, and leave before they realize what happened.
2. (noun) A premature ejaculation, most specifically during a hand job. It is often unexpected.
2. "I rested my head on his chest for a second because I was starting to get tired, what with my hand moving so fast, and then I just got a yand to the face, out of fucking nowhere."