Green’s Dictionary of Slang

negatory adv.

[SE negative]

(US, orig. milit.) no, negative.

[US]M. Myers et al. Wayne’s World II [film script] Obnoxious Dan: Negatory. Okay!
Online Sl. Dict. 🌐 negatory 1. no, negative. (‘My answer would be negatory.’).
[UK]‘Aidan Truhen’ Price You Pay 37: [H]ow do you feel about maybe some gold teeth? Negatory.