oo

toodle-oo

A quaint, informal, and lighthearted expression of farewell. Primarily heard in UK. Thank you for your hospitality, but I had best be going. Toodle-oo! She waved out the window of the train to her family and shouted, "Toodle-oo!"

tootle-oo

A quaint, informal, and lighthearted expression of farewell. Primarily heard in UK. Thank you for your hospitality, but I had best be going. Tootle-oo! She waved out the window of the train to her family and shouted, "Tootle-oo!"
Farlex Dictionary of Idioms.

Toodle(-oo)

(ˈtudlæ(ˈu))
interj. Good-bye. Take it easy. Toodle-oo.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • Toodle
  • toodle-oo
  • tootle-oo
  • tootles
  • toodles
  • catch (one) on the flip side
  • have a laugh
  • (I'll) see you when I see you
  • a scholar and a gentleman
  • (I'll) see you (again) (real) soon