Green’s Dictionary of Slang

extremely, very.

1826		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.
c.1950		Nunnery versus Fuckery 47: He had fucked her stupid.
1969		‘Iceberg Slim’ Mama Black Widow 184: He had gotten [...] stupid drunk.
1995		(con. 1985–90) P. Bourjois In Search of Respect 86: It [i.e crack selling] was stupid slow tonight.
2001		A. Sillitoe Birthday 46: She was being fucked stupid by one of the chief embroiderer’s.
2006		P. Carey Theft 95: I was shtupping her stupid.
2022		J. Hannaham Didn’t Nobody Give a Shit 281: [M]akin stupid phat money.