Quaintance

Quaintance: noun. A person you know but try not to associate with, because they're a bit strange and not in a good way. This word was created by C.S. Lewis in his later years after he'd had a falling out with J. R. R. Tolkien and needed a word to describe and degrade him amongst their Oxford colleagues. He thus created the word and then publicised it and its definition across the university before flying a poster claiming "Tolkien is my quaintance" from the Radcliffe Camera.