What is bro-testament?

Bro-testament - bro-test-tah-ment
-noun
1. Supreme law between bro's
2. Grants thy bro ultimate obedience when used upon said bro
3. One-time usage until cool down time (1 year) is met
4. Used in a time of urgency and at the bro's own discretion
-Should the bro dishonor the testament is grounds for termination from broship