Green’s Dictionary of Slang

(Aus.) to titivate, to dress up in one’s finery.

1947		South Eastern Times (Millicent, SA) 4 Jul. 3/3: Why not suggest that the Australian soldier’s uniform should be tizzied-up with a pair of air force pilot’s wings? It would look stunning.
1968		S. Gore Holy Smoke 28: Come on, and while you’re gettin’ tizzied up I’ll word yer Mum to slaughter a fatted calf.
1988		McGill Dict. of Kiwi Sl. 113/2: tizzy up dress up for an outing; probably derived from ‘titivate.’.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].