GBB Views 11 meanings found GBB can refer to a type of firearm mechanism, a tourist glass‑bottom boat experience, a sustainability certification body, or a marketing phrase meaning good, better, best. Miscellaneous Green, Beige, and Black Glass Bottom Boat Geng Bilik Bacaan Good Better Best Gas Blowback but Community Garcia Birthday Band Academic & Science Gas Blow Back Regional Gara Djebilet, Algeria Internet Guest Book Buddy Business Green Business Bureau Gilchrist Business Brokers