caution to snakes🔊noun1Archaic, Slang Something bizarre or astonishing.I am crammed full of faults, I'm a mass of mistakes / So stupid, in fact, that you'd deem me half-witted; / But though in my way I'm a "caution to snakes," / I think I'm a party who ought to be pitied.1878, Fun, volumes 27-28, page 11: