Dictionary
dou'ble Dutch'
Slang.
unintelligible or garbled speech or language:
She could have been talking double Dutch for all we understood of it. Dou'ble Dutch'
(sometimes l.c.)
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.