When the ball sack skin sticks to the inside of the legs and stretches out, making the sack look like a bat wing. This generally occurs due to excessive heat and sweat and can be avoided with a light dusting of the nuts with some baby powder.
Chris: I can't go see my girl with bat wing syndrome
Chad: don't worry man, dust your nuts lightly with this baby powder and you're all good
When someone puts their arms out to represent wings and acts like they are a flying airplane while passing gas and leaving a vapor cloud in their wake. As to represent themselves as bomber airplane that is dropping bombs.