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1.
When you're sweaty, and your sac starts stickin to your inner thighs.
Aw man, I have the worst bat wings right now
by Bobbo February 14, 2003
 
2.
When you stretch the extra skin betwen your balls out far and flat, like a sheet of paper. So you can see the veins and everything, like a batwing.

So i asked him if this was the can of pant he wanted, and when he looked over i was givin' him the batwing.
by sLuGo January 13, 2006
 
3.
when your sack sticks to both legs
"damn i have major batwings right now"
"batwings release!"
by anonymous February 12, 2004
 
4.
To grab the extra skin on ones scrotal tissue and stretch them out to each side, with the penis in the middle. The veins in the testicles resemble the structure of a bats wings.

Term used in the movie "Waiting" which deserves three kicks if caught looking at one.
"aww no!! not the bat wing!!"
"haha, gotcha my friend. now that three kicks you raging cock-smoker"
by mentallyblind February 13, 2006
 
5.
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
Damn this NorCal heat, I've got a brutal Bat Wing goin.
by its426 October 22, 2003
 
6.
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
 
7.
When one's scrotum sticks to the inner thighs due to sweating in the groin area. This situation can be nicknamed 'Batwings' because the image created by this scenario can resemble a bat and its wings. The shaft of the penis can be see as the body and the stretched scrotum to either side can be seen as the wings. Many males (and hermaphrodites) find this common occasion displeasing.
Batman: It sure is hot in this cave.
Robin: Yeah I know, I'm beginning to have batwings.
Batman: That was very unnecessary.
by How are you today? October 05, 2009