A batwing is when spikey pulls his ball sack to the side and you can see the veins.

Labia that is pulled/stretched out and is gray in color.

The sight of the labia manually spread apart. Usually seen in amateur pornography or gynaecology textbooks.

when a you spread the skin of your ballsack so you can see all the veins and shit

A painfull heat rash on your inner thighs caused by a combination of heat , sweat and friction . Can sometimes be avoided by a liberal dose of cornstarch . Sometimes Not .

Used by males to describe weather so hot, one's testicals stick to the inner thigh.

when the shit get squished between your ass cheeks it looks like a batwing.