Geebs the full term of the word (gravity bong),it is a smoking device in which you have a half of a soda bottle and a the cap from the soda bottle with a metal peice in the middle of it so you can put your choice of THC,or potporie in it.you need a bathtub or a koolaid picture fill up with water and light your THC or potporie pull the half soda bottle up and watch as it burns creats smoke then you inhale the choice of smoke.and you are high.:)
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