Green’s Dictionary of Slang

crown n.1

1. [late 19C] the female genital area.

2. [1960s] (US black) a hat.

3. [1970s+] (US gay) the glans penis.

In compounds

crown and feathers (n.) [ext. feather n. (2); playing on a typical name for a public house]

[mid–late 19C] the pubic hair.

SE in slang uses

In compounds

crown jewels (n.) [their importance to the possessor]

[1960s+] the male genitals.

crown office (n.) [a pun on legal SE]

[late 18C–early 19C] the head.

In phrases

crown of sense (n.)

[late 17C–19C] the vagina.

in the crown-office (adj.) [play on SE crown (of the head), which suffers]

[late 17C–18C] tipsy.