a dude you meet during your formative or developmental years who always has your back through thick and thin. you keep in touch and make an effort to hang out. play sports with one another, buy a beer for. often the person you go to to when your girl wont cut it or dies. secrets exist because there is much love and trust and some things don't transfer between gender.
"seriously mike, are you gay for jon?"
"no, he's my man man, i'd do anything for him"
"you're jealous, stop hating, and go find one for yourself"
"i got a girl"
"a girl is different than your best friend, they can become your wife"