Green’s Dictionary of Slang

candlestick n.1

1. the vagina [a place into which the phallic ‘candle’ is inserted].

[UK]Mercurius Fumigosus 26 22-30 Nov. 221: Wouldn’t my Sister afford you a Candle-stick quoth Moll, and putting her hand to her breech, dropt a Piece of clay, & stuck it at her bed’s head; which Dick smelling, cry’d foh.
[UK]Farmer & Henley Sl. and Its Analogues.
[UK]Farmer Vocabula Amatoria (1966) 60: Chandelier, m. The female pudendum; ‘the candlestick’.

2. in pl., small, bad or untunable bells [? the impossibility of getting a clear note when striking a candlestick].

[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.