The act of being ejaculated on, while wearing a rain poncho, or equivalent (e.g. garbage bag) by a group of masturbating men.
"I'm planning on checking out the Sunday night hentai show at the porno theatre, so I'm bringing a poncho. Let the tarping begin!"
OR:
"Sounds like it's raining."
"No, that's just those pervs tarping that old lady."
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