Green’s Dictionary of Slang

1. fleas.

1960		J. Franklyn Dict. of Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.

2. (orig. milit.) cheese.

1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 269: Stand At Ease; Cheese.
1940		Barrier Miner (Broken Hill, NSW) 30 Mar. 5/2: The digger who went along to order some rations from the British Tommy [...] ‘Uncle Ned, Cable Tram, Stand at Ease, Commander in Chief’ [...] ‘Bread, jam, cheese, beef’.
1952		Argus (Melbourne) 13 June 4s/4: We will not wout our vical chords any earlier [...] by saying ‘stand at ease’ instead of ‘cheese’.
1960, 1975		Wentworth & Flexner DAS.
1971		J. Jones Rhy. Cockney Sl.
1979		R. Barker Fletcher’s Book of Rhy. Sl. 26: A pound of stand-at-ease.
1981		P. Wright Cockney Dialect and Sl. 103: stand at ease [...] ‘cheese’.
2002		B. Kirkpatrick Wicked Cockney Rhy. Sl.