Green’s Dictionary of Slang

spigot n.

the penis; thus spiggot-hole, the vagina.

1653		Urquhart (trans.) Rabelais I iii n.p.: Honest widows may without danger play at the close-buttock game with might and main for the... first two months... If the devil would not have them to bag, he must wring hard the spigot, and stop the bung-hole.
1683		‘Supplement to The Last Will and Testament’ in Lord Poems on Affairs of State (1968) III 409: Tap and spigot were dispos’d before, Or that had serv’d some Belgic commonshore.
1694		Comforts of Whoreing 10: A Vessel of Delight fit for the Butler’s Broaching, who claps in his Spigot, and so tickles her Firkin.
1714		N. Ward Miseries of Whoring 157: He takes his Spigot out of hand / And broacht her pretty Firkin of Delight.
1719		in D’Urfey Pills to Purge Melancholy VI 91: A Spicket of two Handfuls long, I use to Occupy.
1759–67		Sterne Tristram Shandy (1949) 338: Are not trouse, and placket-holes, and pump-handles – and spigots and faucets, in danger still, from the same association?
1798		‘Goody Burton’s Ale’ in Hilaria 79: For till I came across it, / She had never had / A spigot in her faucet.
1836		‘Come, Draw Your Peg, My Rum One’ in Cockchafer 21: Yours is the peg, but the spiggot-hole is mine!
1890–1904		Farmer & Henley Sl. and Its Analogues.
1893		‘Bob Sterling’ Town-Bull 9: I worked my spigot [...] into her bung-hole.
1902		D. St John Memoirs of Madge Buford 52: I pointed [‘Ralph’s rooser’] at her centre of attraction and gave myself up to [...] their lusty working bung and spigot.

In compounds

spigot-sucker (n.) [suck v.¹ (1)]

a fellator or fellatrix.

1890–1904

Farmer & Henley Sl. and Its Analogues.