Green’s Dictionary of Slang

jokess n.

[jock n.1 (1)]

the vagina.

[UK]‘I’d Be a Member Mug’ in Flash Olio in Spedding & Watt (eds) Bawdy Songbooks (2011) III 203: I’d be a member-mug, up in a chamber, / Where wim wams, and fancy’s, and jokesses meet .