Green’s Dictionary of Slang

whoosker! excl.

also whooska!
[echoic of the sound of a cork flying from a bottle of champagne and the rush of liquid that follows]

(Aus.) used of a sudden action .

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[Aus]M. Coleman Fatty 139: ‘[E]veryone’s yelling and cheering as he pulled out the cork and whoosker - all the booze flew out of this thing and poured over Bob Hawke’.
[Aus]P. Vautin Turn It Up! 140: You’re in the aisle battling away amongst the throng when whooska some lovely old lady has pushed her shopping trolley into your ankle from behind.