Green’s Dictionary of Slang

hatchway n.

(orig. naut.)

1. the mouth.

[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.
[UK]Leicester Jrnl 4 Dec. 4/5: D’ye sose I’ll close up the hatchway of my mouth? If so, may old Davy Jones sink me in his locker.
[UK]Barrère & Leland Dict. of Sl., Jargon and Cant.

2. the vagina.

[UK]Farmer & Henley Sl. and Its Analogues.
[UK]Partridge DSUE (1984) 535: [...] from ca. 1865.