ozard, adj. — Green’s Dictionary of Slang

ozard adj.

[a play on the book/film The Wizard of Oz; i.e. the opposite of Wizard is Ozard; poss. found only in Buckeridge]

(UK juv.) ghastly.

1950

A. Buckeridge Jennings Goes To School 20: You’ve heard of the Wizard of Oz, of course. Well, obviously, the opposite of wizard is ozard [...] That shepherd’s pie we’ve just has was supersonic muck so it’s wizard, but this school jam’s ghastly so it’s ozard.