famous last words

noun

a) A notable final utterance before death, especially one made by a celebrity or historical figure.

Lawrence died defending his vessel and his famous last words, "Dont give up the ship," have been familiar to every schoolboy.

b) A statement which is overly optimistic, results from overconfidence, or lacks realistic foresight.

When Arrias husband was hesitating to kill himself, she stabbed herself with his dagger, to demonstrate to him how to accomplish a noble suicide. Her famous last words—Paete, non dolet ["Paetus, it does not hurt!"].