Green’s Dictionary of Slang

1. Jewish.

1933		Townsville Daily Bull. (Qld) 3 June 12/4: Here’s you moonin’ about the run scarin’ the gizzards out of everything with yer squawkin’ Ikey Mo harp.
1999		T. Moore ‘Bazza McKenzie Holds His Own’ Workers Online 11 Jun. 🌐 Bazza and his mates don’t care much for ‘abos’, ‘heathen chinee’, ‘yellerens’, ‘ikey-mo type bastards’, Pakistanis, ‘frogs’, ‘wogs’ and ‘dagoes’.

2. artful, crafty, knowing.

1932

Gloucester Advocate (NSW) 2/5: One matter the committee wants to keep in mind [...] is the high entrance fees charged in horse events [...] Boys with horses are about fed up with these Ikeymo stunts.

3. having a good opinion of oneself, stuck-up.

1889–90

Barrère & Leland Dict. of Sl., Jargon and Cant.