Green’s Dictionary of Slang

brim v.

[dial. brim, of a boar, to have intercourse with a sow]

of a man, to have sexual intercourse; thus brimming n.

[UK]B.E. Dict. Canting Crew n.p.: Brimming, a Boor’s copulating with a Sow, also now us’d for a Man’s with — [a] Brim.
[UK]N. Ward ‘The Dutch-Guards Farewel to England’ in Writings (1704) 142: Farewel to our Landladies, Heaven reclaim ’em! / Who suffer’d Dutch Boors to heartily Brim ’em.