Research and Development (R&D) that has gone sour and lost money.
At one time, Netflix was the R&D shit. Now it's all Rust&Dust.
by William Dean A. Garner November 7, 2011
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The dust that spreads from a ginger person's head normally in strong winds or through scratching of the scalp. Be careful, rust dust is very contangious. If the small particles that constitute a ginger man's head spread on to another human it will instantly turn them ginger too. Also known as the ginger disease.
John stop spreading your filthy rust dust around, you'll infect us all!
by homes1235 April 25, 2010
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Grating a frozen poo.

All the scent off poo, with none of the evidence.
On my last shift work before moving away. I stayed back late and did some rust dusting in the bosses office.
by tinyzzz January 6, 2014
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Term used at auto dealerships to describe supplemental "paint protection" and rustproofing that is sold during the part of the sale where the financing is arranged. It is a source of "back end" profit for the dealer.
"That customer was a total lay-down; he bought Slip & Trip (disability insurance), Choke & Croak (life insurance) and Rust & Dust"
by St. Jerome December 9, 2008
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The 3 phases of marriage
Lust, Rust, Dust

Lust - when the flame is there
Rust - when the flame hasn't been there for a while
Dust - time for a divorce
by TheDutchDutchess February 19, 2011
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