1. An activity involving multiple bros
, oftentimes being a party or trip to a local fast food restaurant.
2. A concert featuring tough guy metal bands that aren't even good such as; Killswitch Engage, Hatebreed, Slipknot, Linkin Park, and other bands.
1. "You want to go to Marc's party later?"
"It's his brother who is having the party, so you know it's going to be a total bro-fest."
2. "You want to go to Sonar tonight?"
"LOL NVM it's gonna be a bro-fest."