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too·dles(to͞od′lz) also too·dle-oo (to͞od′l-o͞o)
Used to express farewell.
[Alteration of toodle-oo, perhaps imitative of a horn or akin to earlier toddle (off), to depart.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
informal rare Brit goodbye
[C20: perhaps imitative of the horn of a car]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014