A saying is any concisely written or spoken expression that is especially memorable because of its meaning or style. Sayings are categorized as follows: Aphorism: a general, observational truth; "a pithy expression of wisdom or truth".

What does it mean when someone says what you saying?

Filters. (UK, MLE, slang) Greeting equivalent to what's up or what's happening.

Do you mean what you say Meaning?

“Meaning what you say” is usually about consistency between one's words and subsequent related behavior or actions. This is where the rubber meets the road. Meaning what you say implies that you can carry through with what ever limit you set forth when you “say what you mean”.