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 16, 2011
The yard on the side of your house.
Do not leave your ATV in your sideyard because it could get stolen.
by Mark Schoenfelt January 07, 2008