Green’s Dictionary of Slang

to have sexual intercourse; thus trouncing n.

1834		‘The Rake’s Register’ in Bang-Up Songster 23: At twenty one my blunt was gone, / The girls I could not trounce them.
1900		Flynt & Walton Powers That Prey 122: You go home an’ see ’f your own wife don’t need a little trouncin’.