The Collaborative International Dictionary
Gardyloo
Gardyloo \Gar`dy*loo"\, n. [F. gare l'eau beware of the water.]
An old cry in throwing water, slops, etc., from the windows
in Edingburgh.
--Sir. W. Scott.
Wiktionary
gardyloo
interj. (context obsolete English) (non-gloss definition: Used by servants in medieval Scotland to warn passers-by of waste about to be thrown from a window into the street below. The phrase was still in use as late the 1930s and '40s, when many people had no indoor toilets.)
Usage examples of "gardyloo".
No one noticed, no one gave a gardyloo, no one tried to buttonhole me.