Green’s Dictionary of Slang

slushy v.

[slushy n. (1)]

(Aus.) to cook; to work as a cook.

[Aus]Bulletin (Sydney) 3 Sept. 36/1: There was only one pub, there then. That was Murphy’s, and he did all right too, because he had no expenses at all, only just a bit of tucker for a drunken old bloke who did all the slushying.