Top definition
A 'Gravity Bong' aka /GB/B/G/Grav which has a removable and long down stem which causes the smoke to be filtered and 'bubbled' through the water before filling the chamber.
How to make a bubble-b
Take two liter soda
Cut bottom
Get metal slurpy straw from 7/11
Insert straw in center of cap
Attach a bowl to top of straw
Insert in bucket
by GEEBMASTERK August 25, 2010
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