When a male acts in a manor which may be perceived as gay only because a women is not around. The affected individual acts as such do to high testosterone levels which make the male want to do gay things such as; whipping his balls out, humping, gay suggestive gestures(verbally), and for instance wearing Man Thongs amongst men.

When you eat dirt for the first time and leave your family to build a shack in the woods

Due to excessively high testosterone levels, a man with this syndrome will act in a gay manner when there are no females present. In other words, they are extremely horny... all the time. For example, suggestive comments or gestures, humping, wearing man thongs amongst men, winking at other men, caressing another man's body, and excessive physical contact are all symptoms of the "Man Thong Syndrome." These dudes ARE NOT GAY, they just require massive amounts of sex, ass, vagina, or anything else they can get.