It was supposedly named after the French Catholic priest Louis Bourdaloue , whose sermon were so long that women brought Bourdaloue so they could urinate without having to leave . The name `` Bourdaloue '' allegedly comes from that of a famous French Catholic priest , Louis Bourdaloue ( 1632 â `` 1704 ) , who delivered such long sermons that females of the aristocracy attending them had their maids bring in such pots discreetly under their dresses so that they could urinate without having to leave .