organic matter in various stages of decomposition on the floor of the forest.
2.
fine, dry coal, especially anthracite.
Origin: 1835–45; orig. Scots dial.; perhaps metaphorical use of duff2, by association with Scots dowf decayed, rotten (see dowf), deaf (of soil) unproductive, springy to the tread
n. the buttocks. : Don't you get tired of sitting around on your duff?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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