Bromo is a word used to describe when two guys do something that could be perceived as a very homosexual act that might require the usage of the term "no homo", but instead because they are bros they casually play it off by combining the terms "Bro" and "No Homo". It is commonly used on the social media website Twitter in the form of "#Bromo".
Swuzz and Tick are two bros playing beer pong. Swuzz throws up a shot and on the follow through he accidentally grabs Tick's dick. They look at each other awkwardly, Swuzz turns and sees that he made the shot in the last cup. He says," Damn, that wet." Then turns back to Tick and they high five and simultaneously say "#Bromo".