I've been asked by people if my 8 lb baby is a teacup.

Sometimes I don't think the public that searches for teacups know what the word means.
But yes, I agree with the others. There is no such thing as a "teacup," just a Yorkie. Some are sighing standard (size wise, color wise, coat texture. Etc) and some aren't. My Kaji is all around off standard but a love bug! Wouldn't change anything about him.