Green’s Dictionary of Slang

(Aus.) strong, but second-rate liquor.

1904		Sun. Times (Perth) 3 Jan. 4/4: Two of the chief luminaries [...] cut loose on the local brand of kill-me-dead, and [...] were lying helmless and whisky-legged in a pub.
1915		Sport (Adelaide) 5 Mar. 2/6: S Y ought to sell the real McCoy stead of his ‘6 o'clock kill me dead’.