Green’s Dictionary of Slang

yokuff n.

[SE coffer]

a large box, a chest.

[Aus]Vaux Vocab. of the Flash Lang.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[UK]Hotten Dict. of Modern Sl. etc.
[UK]Sl. Dict.
[UK]Newcastle Courant 25 Nov. 6: Just before bolting I snammed these out of the yokuff we’d just opened.