Green’s Dictionary of Slang

bat and bowl v.

[cricket imagery, batting and bowling are the two antithetical positions in the game]

to be bisexual.

1984		Partridge DSUE (8th edn) 57/1: since ca. 1950.
1993–2002		Probert Encyc. 🌐 Bat and Bowl is British slang for to be bisexual.