Green’s Dictionary of Slang

(US) at all, used as a negative emphasis.

1984		J. Fuller Fragments 159: And now they’re sending me back to the Place, and I won’t even have to see that filthy bitch again [HDAS].
1989		P. Munro Sl. U. 139: not even not at all— My bio professor [...] is going to give everyone an A.—You’re not even serious! I just dropped that class .