Green’s Dictionary of Slang

stupid adv.

extremely, very.

[UK]Pierce Egan’s Life in London 15 Jan. 406/1: I was stoopid drunk that ere time, and didn’t know what I was about.
[UK]Nunnery versus Fuckery 47: He had fucked her stupid.
[US]‘Iceberg Slim’ Mama Black Widow 184: He had gotten [...] stupid drunk.
[US](con. 1985–90) P. Bourjois In Search of Respect 86: It [i.e crack selling] was stupid slow tonight.
[UK]A. Sillitoe Birthday 46: She was being fucked stupid by one of the chief embroiderer’s.
[Aus]P. Carey Theft 95: I was shtupping her stupid.
[US]J. Hannaham Didn’t Nobody Give a Shit 281: [M]akin stupid phat money.