1. adjective Characterized by red or rust-colored soil or dust. I love running along the rusty-dusty trails in the foothills of these mountains.
2. slang One's buttocks. Primarily heard in US. Get up off your rusty-dusty and go take out the trash!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. the posterior; the buttocks. (see also duster.) I almost kicked him in the rusty-dusty.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.