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A phrase that means, "Go hook up with that person". A metaphor for how a squirrel fervently digs for a nut in the ground.
At a party...
Girl One: "Whoa, he's hot."
Girl Two: "Get that nut."

Guy One: "Whoa, she's hot."
Guy Two: "Get that nut."
by Jordan Used July 02, 2009
Desire to ejaculate.
I want to get that nut tonight. I haven't had sex in over a month.
by Marcus Bunny August 13, 2008