Green’s Dictionary of Slang

1. (Aus.) a counterfeit coin or note.

1906		Sun. Times (Perth) 29 Apr. 4/8: A member of the ‘gun’ club had ‘rung in’ a spurious half-sovereign on him [...] and a brace of bush bobbies [...] were much pained at their failure to discover any more ‘crookies’.
1908		Sun. Times (Perth) 8 Mar. 4/7: This fiver’s a crookie, ole man, so you jist gimme a fair-dinkum quid.

2. a fool, an idiot.

1908		‘Doss Chiderdoss’ ‘Money and Matrimony’ Sporting Times 22 Feb. 1/3: Do not boast, so that you in her eyes may appear / To be wealthy, and not a mere ‘crookie’.
1970		B. Crump ‘A Good Keen Girl’ in Best of Barry Crump (1974) 238: Betty’ll want to check her over to make sure you haven’t got yourself tied up with a crookie.

3. (Aus.) one who enters a sporting event under false credentials.

1910

Sun. Times (Perth) 19 June 3rd sect. 17/3: It was in a Sheffield Handicap [...] that a ped was ‘rung in.’ [...] Dug walked up the track and said to Joe Byrne: ‘You have a crookie here. Just bring him out and we'll have a look at him’.

4. something unpleasant; of food, ‘off’.

1963–74

B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 42: Gaghhhh!!! Jeez! I struck a crookie.

5. (N.Z.) an unpleasant, unreliable or dishonest person.

2003

McGill Reed Dict. of N.Z. Sl. 55: crookie Someone unreliable or plain bad and dishonest. ANZ.