n. a foolish oaf; a bumbler. : Pete's just a duffer—he's not really serious at it.
n. an unskilled golfer. : Those duffers up ahead are holding up the game.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
duffer
"old man," also "bad golfer," 1842, probably from Scot. duffar "dull or stupid person." But perhaps rather from 18c. thieves' slang duff (v.) "to dress or manipulate an old thing and make it look new."