To engage in lewd sexual acts or "hook up" with a person on the side yard of a house.
Nick: "Yeah I sideyarded this chick last weekend. We unleashed our bodies on each other. It's was awesome and shameful at the same time."
by TayGuns November 17, 2011
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Do not leave your ATV in your sideyard because it could get stolen.
by Mark Schoenfelt January 7, 2008
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