URINAL of the Planets,
Ireland, with us, because of its frequent and great Rains; as Heidelberg, and Cologn in Germany, have the same Name upon the same Account; also a Chamber-pot, or Glass.
Urinal of the Planets in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).