Winding out my spill

This is the excerpt (taken from an old movie, USA 1948)

Magician (voice-in-off):
We had three 12 minutes shows a day. The act deserved better billing. It was a phoney, of course, like most mind reading acts, but it was a first class phoney, Nobody knew how we did it. It was in the late night show, Jenny was collecting the envelopes with the usual familiar questions: "Will I take a trip?", "Is my husband unfaithful?" I was winding up my spill.

(The magician begins speaking to the audience): Well, ladies and gentlemen...

I know that wind up could mean "to invent with the intent of conning" "trick somebody with lies" , and I think that here this is the case, but what about spill? Can it mean here wordiness? Or maybe just a speech? The only meaning I know for this word as a noun is "the act of causing or allowing a substance to run or fall out of a container".