bull’s eye n.
1. [late 17C] the vagina; joc. euph. coined by John Wilmot, Earl of Rochester (1647–80).
2. [late 17C–late 19C] a crown or five-shilling (25p) piece [later use is SE].
3. [early 19C–1950s] a large, round sweet.
4. [mid-19C] a bull’s-eye lantern.
5. [mid–late 19C] a thick, old-fashioned watch.