Green’s Dictionary of Slang

sally-port n.

[SE sallyport, ‘an opening in a fortified place for the passage of troops when making a sally’ (OED)]

1. the vagina.

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[UK]Mercurius Democritus 3–10 Aug. 91: This pure piece [...] was once a special friend to Tom ( a witty young man) so that her Salliport lay open at any time for his use.

2. the anus.

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[UK]Mercurius Democritus 28 May 11: A pan full of yellow stuff (though all be not gold that glisters) which came from the back Salliport of her Daughters nasty ugly & beastly Cook-room.
[UK]‘Peter Aretine’ Strange Newes 1: Bette. [...] Our tumbling exceeds their recreation as far as Gold doth the evcuation of a young Gentlewoman’s back Salliport.