1. The view of a woman's external genital features as seen up-skirt while seated (no underwear).
Person 1: "Hey look over there!"
Person 2: "Is that what I think it is?"
Person 1: "Yep, it's a porch beaver."
Person 2: "Ah, the mythical and endangered porch beaver."
by bbweee January 1, 2006
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