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Meaning of double Dutch

dou'ble Dutch'

Pronunciation: [key]
— Slang. Slang.
  1. unintelligible or garbled speech or language: She could have been talking double Dutch for all we understood of it.

Dou'ble Dutch'

Pronunciation: [key]
— (sometimes l.c.)
  1. a form of the game of jump rope in which two persons, holding the respective ends of two long jump ropes, swing them in a synchronized fashion, usually directed inward so the ropes are going in opposite directions, for one or two others to jump over.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.