Green’s Dictionary of Slang

Gerty Lee n.

[rhy. sl.; ult. late 19C actress Gertie Lee]

(bingo) the number 33.

1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 122: 33, ‘Gerty Lee’.
1960		J. Franklyn Dict. of Rhy. Sl.
1972		Dodson & Saczek Dict. of Cockney Rhy. Sl.