Green’s Dictionary of Slang

(Aus.) of a place or object, to decorate or improve; of a person or a place, to titivate.

1925		Land (Sydney) 25 Sept. 10/4: Beat eggs for 10 minutes, add sugar and beat 10 more minutes, then add flour mixed with cream of tartar, boil butter and milk then add soda: add quickly to the mixture, as it will tizz up any flavouring.
1946		Sun (Sydney) 12 Dec. 13/1: The sudden disappearance of staff cadets [...] was explained to me by Prue Vowles who told me they had gone to ‘tizz-up’ the gym for the ball that night.
1947		Argus (Melbourne) 22 Aug. 10/4: About 100 hats have already been collected - some never worn [...] while some bear labels of overseas designers, and others just need to be ‘tizzed up’ .
1953		Baker Aus. Speaks.