Green’s Dictionary of Slang

cockchafer n.

[cock n.3 (1) + SE chafer, that which chafes or rubs painfully]

1. [mid-19C] a woman, occas. a man, who permits or encourages a good deal of sexual intimacy but not intercourse.

2. [mid-19C] a prostitute.

3. [mid–late 19C] (UK Und./prison, also chafer) a prison treadmill.

4. [late 19C] the vagina.

5. [1920s–40s] a general term of abuse.