n. an old-fashioned thing or person; an outmoded thing or person. : That's just old hat. This is the modern world!
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
old hat (adj.)
"out of date," first recorded 1911. As a noun phrase, however, it had a different sense in 18c. The "Classical Dictionary of the Vulgar Tongue" (1796) defines it as, "a woman's privities, because frequently felt."
