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1.
The act of masturbating and pooping simultaneously; the lonely version of a blumpkin
Kevin is in the bathroom mooping.
by IrDewey June 12, 2009
 
2.
whilst mooning someone the mooner takes a poop.
dude, mark was mooping last night and got poop all on this guys windshield - he was pissed.
by bubbap October 04, 2011