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A grape (or any other flavor) blunt that has been dropped in the toilet while being passed. This can only happen when hot boxing a bathroom. To make a blunt a potty blunt, it must not only be dropped in the toilet, but then dried and smoked.
E:"AH SHIT MAN! Why did you drop it?"

A: "It's cool, we'll have a pottyblunt."
by Blasferatu November 20, 2009
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