n. an annoying person or thing. : Cars can be such a headache.
n. liquor. : Pour me some more of that headache, will you?
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
headache
O.E. heafod ece, from head + ache. Colloquial sense of "troublesome problem" is first recorded 1934.