Green’s Dictionary of Slang

(Aus./N.Z.) to make a fuss, to whinge.

1993		M.B. ‘Chopper’ Read How to Shoot Friends 76: Ranting and raving, rolling about and sooking at the injustice of it all.
2005		M.B. ‘Chopper’ Read Chopper 4 41: I like being 12th man. I don’t know why some of the Test players sook when they end up in that position.
2021		Betoota-isms 267: ‘Some Karen was having a go at the waiter for the slow service, she was sooking like a blue-haired yuppie’.