Green’s Dictionary of Slang

1. (also lockey) the vagina.

1833		‘The Parish Priest’ in Regular Thing, And No Mistake 74: So then Mr. Priest, if you’d keep a whole lockey, / Leave Onah’s two sweet lips to Darby alone.
1890–1904		Farmer & Henley Sl. and Its Analogues.

2. (US) the stomach.

1855		H.A. Wise Tales for the Marines 224: Let’s get a bite of breakfast into our lockers.
1985		M. Baker Cops 63: [He] put three [i.e. shots] right in the fucking locker on this guy from about three foot away.

3. (US Und.) a safe.

1905		‘Doss Chiderdoss’ ‘What Winifred Wanted’ The Sporting Times 29 Apr. 1/3: Her locker was filled with the right sort of shot, / There was more there than Winifred wanted.
1929		C.G. Givens ‘Chatter of Guns’ in Sat. Eve. Post 13 Apr.; list extracted in AS VI:2 (1930) 133: locker, n. A safe.
1949		Monteleone Criminal Sl. (rev. edn).