Abbreviation for: Bald-ass Mother Fucker (noun) -a cathartic way to describe someone who does selfish things with no regards for others AND has no hair
BAM is an acronym using the first letter of each of three hot dudes who pal around together, such as Barry, Arlo, and Mike; or Bill, Aaron, and Miles; or Beckham, Ayden, and Mason. This trio of friends is 'BAM', or 'BAM!', or the 'BAM Crew'.
Did you see BAM coming down the hallway just now? They are a fucking panty-dropping machine!