Is Negatory a Word?

marked by negation; denying; negative.

What does Negatory mean?

: marked by or having the nature of negation : negative negatory criticism.

Why do they say Negatory?

Negatory is either a joke word, making fun of official jargon, or a genuine local variant of negative. It is not an official word of English; like ain't, hafta, wanna, and shee-it, it's considered "dialect".