Green’s Dictionary of Slang

(Aus./N.Z.) a fit of temper; a bad mood, thus crack, pack, throw a shitty, to exhibit a bad temper.

1971		T.R. Shadbolt Bullshit and Jellybeans 34: Jo went off on an oasis crawl and when he came back she [i.e. his chick] was up the duff. Well, old Jo throws a bit of a shitty but Mary tells him about this invisible guy God who’d done it [DNZE].
1977		R. Braddon Finalists n.p.: ‘Sorry I had a shitty on you,’ King murmured.
1982		Lowenstein & Hills Under the Hook 76: We wouldn’t work, we’d be sitting there for two hours, and if he had a shitty, old McKinnon, he wouldn’t let us go home.
1985		‘Thommo’ Dict. Aus. Swearing & Sex Sayings 92: PACK A SHITTY — To sulk, glare or frown while stroppy and unsociable.
1988		McGill Dict. of Kiwi Sl. 101/2: shitty bad mood, phrs. crack a shitty, pack a shitty, throw a shitty; eg ‘I bet you he throws a shitty now we’re starting to win.’.
2003		McGill Reed Dict. of N.Z. Sl. [as cit. 1988].