Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Chiefly British Slang Insane; mad.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Plural form of cracker.
  • adj. Crazy; mad.

from the GNU version of the Collaborative International Dictionary of English

  • adj. crazy.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. informal or slang terms for mentally irregular

Etymologies

Probably from cracker, breakdown.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From firecrackers in the head. Originally "He's got the crackers" then "He's gone crackers". Started as UK naval usage in the 1920's. (Wiktionary)

Examples

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Comments

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  • This is a very
    democratic lounge:
    Schultz lectures logic,
    Fats is a binman.
    Fats gulps mild. Schultz pays.

    Schultz sips dry Vermouth.
    They are both crackers...

    - Peter Reading, 5x5x5x5x5, 1983

    July 1, 2008