Bromosexual
A man who is completely straight but who every once in a while says something about a bro that implies sexual attraction. Will often compensate by saying "No homo."
Steve- "Dude, did you grow your hair out? It looks really good. No homo."
John- "Uh, thanks?"

Later...
John- "Hey, do you think that maybe Steve is gay?"
Nick- "I don't think so; probably just a bromosexual."