A group of three guys who like to hang out and morally support each other. They mediate between them and like to sing the popularized tune of "We're the three best friends that anyone can have!" They are usually "Nice Guys". Either none of them have girlfriends as of yet, but until then, they are a man trio.
Girl: "Why are there three guys hanging with each other, seems weird..."
Girl 2: "Man TRIO!!!!!"
Girl: I feel sorry for them, no lives, oh well!