JBT Share definition Flag Abbreviation for Jack Booted Thug, in reference to nazi storm troopers or ATF agents, an overbearing government law enforcement official The damned JBT stomped on my kitten after shooting my dog, my wife and torching my house. JBT by MitchD December 8, 2005 0 0 Get merch Get the JBT mug. Buy Now — $32.95 See more merch