n. an old person. (Usually objectionable.) : I know who's slowing traffic up ahead. A FOP, that's who.
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
fop
1440, "foolish person," perhaps related to fob (v.) via Ger. foppen "jeer at, make a fool of" (see fob (v.)). Sense of "dandy" is 1670.