the skeleton finger
A sex move that involves three people. Two are engaged in the act of intercourse, and a third parties "dead arm" is used to jerk, stroke, bate, bang, blast or jiggle one of the two person's genitals during the act of sex. The third partner is just a hand donor and seeks no rewards.
Miles, your arm is needed for a finger blasting at 12p pacific standard time. Please come to our house, pre-dead armed and ready to award the skeleton finger.