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.

when you stretch out your ballsack like paper, then get another man to inadvertently look at it. This is followed by the ballsack exposer calling the looker gay and kicking him in the ass twice.

when you get real sweaty and your ball sack sticks to your legs and you spread them.

The excess skin of your ballbag when it sticks to your inner leg on a hot day. When spreading your legs the skin streches and looks like a Batwing! All veiny and stuff!

When you sweat intensly, specifically near the groin, and your ball sack sticks to your leg. You Try to move your legs, or shake em, to try to destick them balls from your leg. Its very annoying, because you try to unstick them, and it doesnt work very often, unless you use your hands. It would be quite rude, if you were seen in public.

The flap of fat under the upper arm of an obese individual. Good to pull out at parties.

"The Batwing"

1)Batwing - The end product of when you pull your scrotum taught, so that it is flat and veiny... like a bat wing!

2)Meaty Bat Wing and Spined Bat Wing also found in WoW.