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The term ghost butthole refers to the last remaining and moat ashy hit in the bowl of a pipe, bong, chalice, or other kind of smoking pipe and typically refers to marijuana smoking. When a bowl is, "cashed," or no longer contains green, it can be considered a a ghost butthole.
"My friend is truly such a cheapskate... he even saves the ghost buttholes and smokes them later!"
by Elizo Emezeta September 06, 2016
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