Just as you need a wing man to help pick up chicks, sometimes it's necessary to bring a wang man to go the bathroom. Sometimes it's to give you moral support an other times it may be to give you someone to talk to while you're pinching one out. Most importantly, above all else it is not gay to be a wang man or have one.

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

(n.) The antithesis of the wing man, the wang man, usually involved in a completely monogamous relationship of his own, protects his monogamous male friends from straying into seductive vaginas while under the influence of excessive alcohol and other mind-altering substances. He is a paragon of modern morality, a paladin of male propriety, master of the righteous cock block and a brave soldier in the fight against drunken hookups, broken relationships, and sexually transmitted diseases.

The wang man may also protect his friends from hooking up with females who are undesirable due to being (a) too drunk to fend for themselves, (b) woefully unattractive, (c) clingers, or (d) suspicious or otherwise untrustworthy.

When a gay guy and a straight guy go out to a bar to land each other a dude and a chick respectively. Like Maverick and Goose if Goose was gay.