Green’s Dictionary of Slang

1. a bean.

1930		(con. 1914–18) Brophy & Partridge Songs and Sl. of the British Soldier.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.

2. a fart.

1960, 1981		J. Franklyn Dict. of Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.