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Stands for "What would Michael Phelps do?". If you saw Michael Phelps smoking a bong and you are no longer in puberty, and you are confused, do not be. It has been proven by experiment (i.e the olympics) that everything Michael Phelps does is a good thing.
"I caught my mom smoking pot!"
"Fret not. It's in times like these we must ask ourselves, WWMPD? But not if you are prepubescent so check your life."
by DrRaoulDuke February 08, 2009
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