1. To become angry or irritated. Primarily heard in Australia. Of course he went crook—you insulted him in front of the whole town!
2. To get sick. Primarily heard in Australia. Oh, she went crook last night, so I'm here to take her place.
go crook1 lose your temper; become angry. 2 become ill. Australian & New Zealand informal
Crook in late 19th-century Australian slang meant ‘bad’ or ‘unpleasant’.
1 1950 Coast to Coast 1949–50 What'd you do if you were expelled? Y'r old man'd go crook, I bet.