"Little friend, do you want to know what I'm saying?"
Here's a breakdown:
* amigito: A diminutive form of "amigo" meaning "little friend" or "buddy."
* quieres saber: "Do you want to know"
* que estoy diciendo: "What I'm saying"
The sentence implies that the speaker is about to say something important or interesting and wants to make sure the listener is paying attention.