Music that is listened to by the group of white trash that mingle outside The Autozone. This term incompasses many genre's to include psuedometal, southern rock jams, and speed metal.
Carl was tweeking his tranny so his dirt rock jam of choice was "What's that smell?" by Lynard Skynard.
by Cramps Delight January 17, 2005
Hardend dirt that has bonded together to form a rock like shape that will break apart and stain upon contact. (often found in your neighborhood garden).
Rock fight, garden rocks, Dirt Rock
by Thalonious mackadocious October 18, 2013