prunsky
"It's when you stick your face between two substantially large breasts and you blow really, really hard, and you shake your head side to side. The combination of the air and the movement causes a sound -- a slapping sound -- that goes in your eardrum, and that sounds is PRRRUNSKY." as defined on the movie Cattle Call(National Lampoon)
During forplay Gene likes to do a prunsky on his wife.