And now let all defenders of present institutions, however bad they may be — let all violent supporters of their old mumpsimus against any new sumpsimus whatever, listen to a conversation among some undergraduates.
-- Frederic William Farrar, Julian Home
She is a master of sumpsimus, more anal in language usage than Doc in his rigid professionalism. She insists on saying It is I, or He gave the book to John and me.
-- Ann Burrus, Astride the Pineapple Couch
Like its counterpart mumpsimus, sumpsimus comes from to a story about an illiterate priest. In this case, sumpsimus refers to the opposite practice as mumpsimus.