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Someone who tends to smoke more than his/her portion of a spliff.

a 'jolly muncher' is extremely familiar with phrases like "shit, sorry mate" or "I completely forgot" however it is advised that these apologies fall on deaf ears as their reluctance/refusal to actually buy any weed at all is remarkably unfaltering.
"shit, did you want any of that spliff?" "too late now isn't it? Nice one jolly muncher"
by ian April 04, 2005
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