pray at the porcelain altar

slang To vomit into a toilet, especially as the result of drinking excessive amounts of alcohol. Doing so often requires one to kneel in front of or bend over the toilet (the "porcelain altar"), a position that is likened to kneeling during prayer. If Tommy doesn't stop drinking, he's going to be praying at the porcelain altar all night. The chemotherapy has had me praying at the porcelain altar throughout the day.