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
1 more definition
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