Green’s Dictionary of Slang

porcelain god n.

also porcelain goddess, enamel god

[1970s+] (US campus) joc. terms for a lavatory, in the context of vomiting; in phr. below and similar.

In phrases

kiss the porcelain god (v.) (also kiss the porcelain goddess, bow to the porcelain god/goddess, hug..., make love to..., pray to..., worship..., pray on the porcelain altar, pray to the enamel god, hug the throne, hug the porcelain, worship the throne)

[1970s+] (US campus) to vomit.