When its hot and sweaty and  your ball-sack sticks to the sides of your legs.  Forming a bat-wing.  See also Half-Caf Batwing
by its426 October 22, 2003
 Get the Bat Wingmug.
Get the Bat Wingmug. Bat Wings are what guys get when things get sweaty downstairs and your ball sack starts sticking to the side of your thighs.
I get batwings everyday at work from sitting for hours. It tickles when i yank them apart from my thighs.
by musclenutz September 28, 2004
 Get the bat wingsmug.
Get the bat wingsmug. Unlike bats wing which is performed purposefully, Bat Wings are the spreading and sticking of ones sack to the inner thigh.  Usually happens at random, in summer months and is caused by the heat and persperation from the hey-nanner-nanner region.
Guy1: Dude, what the hell are you doing down there, have you got crabs or something?
Guy2: No, sorry man just have to adjust the bat wings.
Guy2: No, sorry man just have to adjust the bat wings.
by Jkids August 16, 2006
 Get the Bat Wingsmug.
Get the Bat Wingsmug. by pod6isblowedup June 1, 2006
 Get the bat wingmug.
Get the bat wingmug. when someone shows their nutsack to someone while stretching it out so it looks veiny like a bats wing.
by flump August 15, 2006
 Get the bats wingmug.
Get the bats wingmug. When your ball sack gets stuck to the side of your leg, generally happens when men sit down and are sweaty.
You sit down, and you can feel your ball sack stuck to your leg. You might say to your friend, "i've got bat wing". 
If heard by some forign people, they , may assume that you are calling your ball sack, bat wing, because it is black and hairy, like a bats wing.
If heard by some forign people, they , may assume that you are calling your ball sack, bat wing, because it is black and hairy, like a bats wing.
by Gandi, the shrivled raison October 10, 2008
 Get the Bat Wingmug.
Get the Bat Wingmug. When a guys ball sack sticks to his inner thighs, and when he spreads his legs to unstick them, they resemble bat wings..
by ATMsk8er92 January 10, 2008
 Get the Bat Wingsmug.
Get the Bat Wingsmug.