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A muddy picnic is same as a Wet Picnic except that the sexual activity involves anal sex and the post coital clean up involves wiping up with the picnic blanket.
Frank and Carol went to the nature trail where their plans for a quick wet picnic turned into a Muddy Picnic. The fried chicken and potato salad ended up going to waste.
by Ben Dribblin March 03, 2015
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