Green’s Dictionary of Slang

to have sexual intercourse.

[1788		‘Answer to Darby O’Gallagher’ in Songs (publ. Newry) 5: Then with his long Rule, / He straight plum’d her Pool].
c.1850		Peeping Tom (London) 12 48/2: I see your intention, I smile at your art, / You’re only for sounding and plumbing me.
1927–28		in G. Legman Limerick (1953) 13: There was a young plumber of Leigh / Who was plumbing a girl by the sea. / She said, ‘Stop your plumbing, / There’s somebody coming!’ / Said the plumber, still plumbing, ‘It’s me’.
1942		in G. Legman Limerick (1953) 21: A plumber whose name was Ten Brink / Plumbed the cook as she bent o’er the sink. / Her resistance was stout, / And Ten Brink petered out / With his pipe-wrench all limber and pink.
1948		in E. Cray Erotic Muse (1992) 247: A lady came in for some fruit one day. / ‘What will you have?’ said I. / ‘Plums,’ she said, and plumb her I did.
1954		in Randolph & Legman Ozark Folksongs and Folklore (1992) I 541: That night I rode in glory as I plumbed her pink insides, / And on the heaving belly I had many splendid rides.
1959		‘Count Palmiro Vicarion’ Limericks 46: There was a young plumber of Lea / Who was plumbing a girl by the sea.