A sexual act between somewhat consenting adults, involving one partner mounting the other while he/she is asleep, whispering "Lemoyne Sleeper, the one stop bedroom shop" in the sleeping partner's ear, followed by a sock to the head with a pillow. As the partner on the bottom jolts awake, the one on top enjoys the ride.
Gina couldn't sleep due to her own arousal, so she stroked Jimbo's cock until it was fully engorged, upon which time she climbed on, gave him a Lemoyne Sleeper, and quickly reached orgasm as he thrashed around underneath her.
von J.J. Jingleheimerschmidt 5. September 2011