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

  • n. Slang A small or worthless amount: His advice wasn't worth diddly to me.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small amount of no worth.
  • n. penis
  • interj. A written representation of a trill sound.

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

  • n. a small worthless amount


Short for diddlyshit; see diddly-squat.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Short for diddly-squat (Wiktionary)
Imitating a sound (Wiktionary)
Possibly shortened from diddlywhacker. (Wiktionary)



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