Green’s Dictionary of Slang

(Aus. teen) furious, angry, in a temper.

1990		Indep. Monthly Sept. 5 n.p.: He’d turned into a petrol head. My first thought was SPEW! [...] Before you do any foolish things, get all the fun you can, like I didn’t. Now I’m spewing [GAW4].
1993		M. Geyer in Sun-Herald (Sydney) Mar. 88: There I was in the lounge waiting for the delayed flight with Guns N’ Roses tickets in my hand. The boys were all singing Gunner songs and in the end I was just spewing because the delay made me miss the concert [GAW4].