Webster's Revised Unabridged Dictionary · 1913

Shill-I-shall-I

Shill-I-shall-I , adverb

[A reduplication of shall I.]

In an irresolute, undecided, or hesitating manner.
I am somewhat dainty in making a resolution, because when I make it, I keep it; I don't stand shill-I-shall-I then; if I say 't, I'll do 't. — Congreve

Also: Shilly-shally