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1.
A verbal exclamation used when a large (and often clumsy) mistake has been made, such as dropping a wine glass on the floor, backing your car into a telephone pole, or forgetting a girlfriend's birthday.

Can also be used in an noun sense, as an affectionate name for a clumsy friend.

The phrase is intended as a suitable, non-vulgar replacement for the more commonly-used exclamations in this context (eg, "Son of a bitch!", "Fuck!", etc).
"Aw, Jiggidy Doo! I totally forgot to pay rent this month!"

*SMASH* Plates smash on the floor.
"Jiggidy-fucken-Doo!"
by Judd Vinet May 03, 2006