Green’s Dictionary of Slang

roll in the hay v.

[roll in the hay n.]

to have sexual intercourse.

[US]C. Cooper Jr Farm (1968) 151: ‘You look like you goin to roll in the hay,’ Joe Antman snickered.
[US]‘Iceberg Slim’ Pimp 28: The country girl had rolled in the hay with the city slicker.
[US]L. Heinemann Paco’s Story (1987) 64: Ah’d love to roll in da hay wit-cha, my sweetes’ little patootie.