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A butthole gravity bong is a device that concentrates marijuana smoke to a degree that leaves the smoker stupid high. The process begins by pouring 12 fluid ounces of water (sparkling or non-sparkling) into one's butthole, followed by shoving a water bottle with a packed ratchet bowl into the anal cavity, then begin to light the bowl and slowly pull up the water bottle. Once the water bottle is out of the anus remove cap, inhale, and enjoy :)
Mike: Wobby wanna come over for some gb's bruh?

Wobby: Nah I'm finna take butthole gb's

Mike: Aight but Faz's butthole got that loud pack tho
by Originator of the butthole gb February 19, 2014
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