Green’s Dictionary of Slang

1. a masturbator [boff v. (3)].

1984

Partridge DSUE (8th edn) 108/1: since ca. 1930.

2. (US) one who has sexual intercourse [boff v. (2)].

1979		Frank Zappa ‘Broken Hearts Are for Assholes’ 🎵 The tale of a demented bread boffer.
1994		J. Wambaugh Finnegan’s Week 45: It takes a bimbo boffer like him to straighten out all the bitches in Washington.