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1.
used to describe when a girl has moist panties.
usually the result of being aroused
like, oh my god, that guy was so hot I have moipan

I'm really horney right now, i've got moipan

Sarah has moipan
by Cwaigles August 10, 2006
 
2.
An abbreviation for the term "Moist Panties"
He's so hot, it's making me Moi Pan
by Aprilhasmoipan June 22, 2011