Top Definition
When a woman wearing a skirt & no underwear briefly opens her legs so that her crotch is visible.
I was sitting on the train and this woman across the aisle basic instincted me!
by McArrr May 08, 2008
1 more definition
as bill hicks would say "piece of shit"
basic instinct is a piece of shit
by billhickslives November 20, 2009

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