Green’s Dictionary of Slang

jaxy n.

also joxy
[? jacksie n.1 (1)]

the female genitals.

[US]Trimble 5000 Adult Sex Words and Phrases.
[US]Maledicta VI:1+2 (Summer/Winter) 131: Vagina […] jampot, jaxy, jelly roll […], jing-jang, joxy.