Pulling your scrotum (nut sack) wide apart to expose the veins through light. To make it appear as a bat's wing.
by HerNextBaby'sFather February 21, 2013
Get the bat flapmug. Dewey meat curtains glazed in smegmetic formenting man muck. Smells more like rotting shellfish but can occasionally hint at skunky odor when a woman is mensturating.
David bent down to kiss Maria's welcoming woman hood when he hit a wall of revulsion emanating from Maria's festering skunk flaps.
by Jimmy Dink February 21, 2017
Get the skunk flapsmug. by Steve M March 22, 2003
Get the pish flapsmug. by tartanbeastie February 13, 2004
Get the pish flapsmug. by spacemonkey007 January 23, 2014
Get the devil flapmug. Shut your pish flaps
by Heldo September 19, 2006
Get the pish flapmug. A flap on the back of a twin tip ski or snowboard that prevents snow and ice from flying up behind the rider.
by Matt Eder March 14, 2007
Get the crud flapmug.