Synonym: (man) friend with benefits
-Hey Kate I saw you kissing some boy at a party. I though you had a boyfriend...
-He's not my boyfriend he is my friendboy, therefore we are free to share our love amongst other people providing we don't do it in front of eachother and that we don't get off with each other's friends.
girl 2: i hung out with brad, my friend boy!
See also: friendgirl
Synonym of: friend just friends
Daughter: He's just a friendboy...