bromosexual adjective 1noun 1forms 1 adjective1 •Relating to a close but nonsexual relationship between two men, usually a gay man and a straight man.His friendships have a "bromosexual" quality, a backslapping circlejerking camaraderie that no woman will ever fully understand. — 2008 noun1 •A man who has one or more close but nonsexual relationships with other men formsbromosexuals