To grab the extra skin on ones scrotal tissue and stretch them out to each side, with the penisin 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.
Usually happen's on a hot day or during a physical workout.
"Dude, I got some serious bat wing right now"
Very common at weddings while wearing a tuxedo.
Sometimes can be corrected without even touching the affected area with a simple leg shake. Other times might need to play a little pocket pool.
Severe cases call for immediate fondling of the genital area.
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