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A plastic grocery bag that often "rolls" across the landscape and over cars, often becoming airborne and continuing on until they find an obstacle such as a fence, hedge or tree branch to light upon.

Another common name, Tennesee Tumbleweed, is something of a misnomer, since most are Made in China for Walmart stores, which distribute them worldwide, and are doomed to roam the earth, forever, and choke out all life.
Joe:"There goes another Walmart Tumbleweed down the road."

Laura:"Where do you think they are going?"

Joe:"To find the others and return to the mother ship."
by hoppin'joe July 03, 2011