A sacred unbreakable promise made between two bro's. Now this can be between to blood brothers or between brothers from other mothers.
Patrick, you better bromise me to quit tokin up soon bro
by Puff(4)Puff(2)Pass(0) February 22, 2010
Essentially a promise you make to a bro. One that you can never break. ever. Stronger than a promise.
"I bromise you that i will never sleep with your girlfriend. ever"
by eSKape March 12, 2009