Secrets of things that only a true bro would understand and never frown down upon. These secrets are kept between the bro-hood at all costs no matter what. Its a bro thing.
Bro #1: Man I gotta tell you something insane. I accidentally slept with that fat chick last night. I'm gonna be so screwed if my girlfriend finds out.
Bro #2: Don't worry about it man. Your secrets safe within the bro-vault