The act of masturbating and pooping simultaneously; the lonely version of a blumpkin
Kevin is in the bathroom mooping.
by IrDewey June 12, 2009
1 more definition
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