Green’s Dictionary of Slang

mow n.

[mow v.]

the act of copulation.

[UK]Grose Classical Dict. of the Vulgar Tongue (2nd edn).
[Scot] ‘When Princes and Prelates’ in Burns Merry Muses of Caledonia (1965) 54: May the deil in her arse ram a huge prick of brass! / An’ damn her in hell wi’ a mowe.
[UK]Grose Classical Dict. of the Vulgar Tongue (3rd edn).
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.