Green’s Dictionary of Slang

tweedle n.

the vagina.

[UK]‘Peter’s Precious Stones’ in Gentleman’s Private Songster in Spedding & Watt (eds) Bawdy Songbooks (2011) III 374: It is about a lady fair, / Who in poking did delight, / Her tweedle was all over hair, / And her name was Susan Bright.