The Collaborative International Dictionary
Tilly-vally
Tilly-vally \Til"ly-val`ly\, interj., adv., or a.
A word of unknown origin and signification, formerly used as
expressive of contempt, or when anything said was rejected as
trifling or impertinent. [Written also tille-vally,
tilly-fally, tille-fally, and otherwise.]
--Shak.
Wiktionary
tilly-vally
interj. (context obsolete English) (non-gloss definition: Expressing contempt, or rejecting anything trifling or impertinent.)