Green’s Dictionary of Slang

cocum adj.

also coakum, cokum, kocum
[cocum n.]

1. resourceful, cunning; also as adv.

[UK]W.A. Miles Poverty, Mendicity and Crime; Report 168: Cocum gonnofs flash by night the cooters in the boozing kens, and send their lushy shicksters out to bring the ruin in.
[UK]Swell’s Night Guide 40: The French shicksters fight coakum better than our shakes; they do not lush nor scrap, and can sweeten a swell better.
[UK]‘Ducange Anglicus’ Vulgar Tongue 9: cocum — very cunning and sly.
[UK]Hotten Sl. Dict.
[Aus]Sydney Sl. Dict. 9/2: Kino’s cocum, and he’s stagging to crack the crib. [...] Kino’s wary, and he is watching to break into the house.
[UK] ‘The Flippity Flop Young Man’ [broadside ballad] A know pretty-well-what-is-kocum young man When addressing a constituency [F&H].

2. sensible.

[Aus]Earl Ups and Downs of Aus. Life 224: No one was to get drunk, the governor said as to how it wasn’t cokum, and he woudn’t have it .
[UK]Leaves from Diary of Celebrated Burglar 41/1: It wouldn’t be ‘cokum’ for me to go, for the ‘bloke’ has already ‘grannied my mug’.
[UK]Sporting Times 20 Jan. 1/5: Tired? [...] Gorblimy, I’m done to the world, and yet it’s ’ardly cocum to—er—stop for arrest, eh?

3. sorted out; arranged satisfactorily.

[UK]Leaves from Diary of Celebrated Burglar 90/2: We then finished the bottle, and walked to the bar where, on ‘squaring up’ with Ned, he said he hoped all was ‘cocum’.