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Moonpigging is the act of going out at night with the intention of getting drunk and then making out with as many hideously ugly women as possible: such a woman is known as a moonpig.

Moonpigging is sometimes the basis for a competition between teenage boys and/or young men - the formation of moonpigging societies is not uncommon.
"I spent the entire night moonpigging"

"I'm currently the leader in our moonpigging competition"
by TomRB June 17, 2008
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