My first thought is prison tat too.. One of my buddy is a 350 lbs 6'5" humongous dude. He did some stupid crap when he was 18 year old, and did 10 year in the pen. He has AB tats for protection among others... It's always funny to bring him to my party, intimidating everyone only to find out he has mike tyson voice and giggles like justin bieber.