Green’s Dictionary of Slang

plumber n.2

[plumbing n. (1)/plumb v.2 ]

(US black) a man with a frequent and varied sex life.

[US]E. Folb Runnin’ Down Some Lines 152: Yes, I’m d’ plumber and I’m here today to lay some pipe! What has the hole the plumber’s gotta put his pipe through? [...] I’ma stone-hope-to-die, fonky plumber!