A male's virginity. It's a metaphor rather than actual anatomical part. Male's who have lost their guymen are generally more confident and outgoing, though this is not always the case.
1. commonly used to describe an open-minded male's anal virginity. literally, guy + hymen.
2. can also be used to describe a not-straight dude's oral virginity, but only when said dude tries to huff a wang that is hopelessly too big for his mouth.
"Dude, why're you walking so funny?"
"I went horseback riding without a saddle and I think I broke my guymen..."
When he gagged and threw up his lunch all over the Persian rug, he knew that something had gone horribly wrong: his guymen had been ruthlessly taken away from him.
Bartender- Would you two bitches shut the hell up? It's not MANther, retard. That's a feline term. Guys are dogs, not cats. The actual term is "Guyena"