"When I use a word," Humpty Dumpty said in rather a scornful tone, "it means just what I choose it to mean -- neither more nor less."
"The question is," said Alice, "whether you can make words mean so many different things."
"The question is," said Humpty Dumpty, "which is to be master - - that's all."
--Lewis Carroll,Through the Looking Glass
Either Carroll was prescient and a prophet, or things have not changed all that much since his day. You heard what I said, but I think you don't realize that what you heard is not what I meant.