a. slang. [said to be euphemism for hell-fired.] Infernal; hence an intensive. (Chiefly in U.S.)
1837. Haliburton, Clockm. (1862), 115. What an all fired scrape he got into.
1862. T. Hughes, in Macm. Mag., V. 244/1. [Berksh. peasant says] A went off wi th most all-fired noise.