1) Having to do with, or specifically relating to the relationship between bros, usually followed with an awknowledgment of the moment having been, no homo.
When 3 or more BROS!!!! are hanging out and something happens that can be perceived gay but its not because 3 or more bros are hanging out.
Don, Joe, and Jeff are hanging out drinking white russians and talking about hot chick, Don and Joe pop a broner and Jeff gives them a brojob. But its not gay because 3 or more BROS are hanging out.
Don- Jeff it's cool this doesn't make you gay.
Jeff- Oh it's cool I'm not homesexual I'm brosexual