adjective, flak·i·er, flak·i·est.

  1. of or like flakes.
  2. lying or cleaving off in flakes or layers.
  3. Slang. eccentric; wacky; dizzy: a flaky math professor.

adjective flakier or flakiest

  1. like or made of flakes
  2. tending to peel off or break easily into flakes
  3. Also: flakey US slang eccentric; crazy

1570s, from flake + -y (2). Meaning “eccentric, crazy” first recorded 1959, said to be American English baseball slang, but probably from earlier druggie slang flake “cocaine” (1920s). Flake “eccentric person” is a 1968 back-formation from it.

The term ‘flake’ needs explanation. It’s an insider’s word, used throughout baseball, usually as an adjective; someone is considered ‘flaky.’ It does not mean anything so crude as ‘crazy,’ but it’s well beyond ‘screwball’ and far off to the side of ‘eccentric.’ [“New York Times,” April 26, 1964]

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