Simply put its the female version of the teabag.
For those really needing a definition, it is touching another (willing or unwilling) person with your vagina.
Peter got wetnapped twice while he was passed out at a party.
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When you have a wetdream while taking a nap
After a long day I ended up taking a wetnap before dinner
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When a girl spits in a guy's eye and then sits on his face.
"We were so drunk last night that I let her mongolian wetnap me"
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using the grease from your pizza napkin as lube to have anal sex
she wanted it up the ass, I was out of KY so I did the the old Italian wetnap maneuver.
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a spicy douche.. includes olive oil, cayanne and jalapenos for a particularly spicy douching experience
My girlfriend is an illegal immigrant who lives in Louisana and uses a cajun wetnap.
That bitch drank all my 4Loko, what a cajun wetnap.
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When you blow your nose in toilet paper then wipe you ass with it.
I was out of wet naps, so I blew my nose in to the toliet paper, to make an Alabama wetnap, and wiped my ass with it.