Green’s Dictionary of Slang

currant-cakey adj.

shaky.

1932		‘P.P.’ Rhy. Sl. 13: Feeling ‘currant cakey’ this morning, give us a ‘waterbury watch’ and I’ll have an ‘ocean wave’.
1960		J. Franklyn Dict. of Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.
1992		R. Puxley Cockney Rabbit.