Toodle-oo

Toodleloo or toodles is used as a way of saying good-bye and it was suggested that the origin might be.. I'm off "to the loo".

Does anyone know?

It's a British thing. Here's what it says in The Oxford Dictionary of Modern Slang by John Ayto and John Simpson (Oxford University Press, Oxford & New York, 1996):
TOODLE-OO int. Also tootle-oo. Brit. Dated. Goodbye. Also toodle-, tootle-pip. 1907- Standard. Toodlepip to the poor British Exec . Origin unknown; perhaps from 'toot' noun, short blast on a horn.

Ioi need ta spenduh penny...