The act of willfully or inadvertently breaking someone's balls. Act can be literal or metaphorical. Acronym often times used in the work-place so that your co-workers or boss don't know what you are saying mainly in the form of office communicator.
Co-worker: Hey, I just got the promotion over you because I told them you are stealing. Oh yea, they fired you too.
You: Dude, you're BMB