Meaning of doodly-squat

doo•dly-squat

Pronunciation: (dd'lē-skwot"), [key]
— n. Slang.
  1. a minimum amount or degree; the least bit (usually used in the negative): This coin collection isn't worth doodly-squat in today's market.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.