homobre is a mixture of the 2 words homo and hombre (spanish word for man).
a man is a homobre when he has crossed the boundary from bromance to fully fledged romance.
you usually start to notice different behavior such as copying everything you do, smelling you hair when you're not paying attention, and "accidentally" bumping his hand with yours.
have you noticed that luis is starting to act funny towards carlos?
yeah dude. he's acting like a homobre.