"Sad" used to mean "sated". Why are you spreading the incorrect usage perpetuated by fools in the 1690s? These days nobody understands me when I use the true definition.
It's one thing when a word evolves. It's another thing entirely when the evolution is the opposite of the original meaning. So let's not get condescending when it's more than a simple shift in meaning, okay?
Also, "sad" and "sated" aren't quite opposites but they're very different. Are you telling me you wouldn't be annoyed if people started talking about how sad they were at the end of a great meal?
http://www.etymonline.com/index.php?allowed_in_frame=0&searc...