That sentence doesn't mean "tell me if you want to listen".
But "tell you something" ~
Speak-that is, say what you mean.
D- Cantonese likes to use the sound d to express some meanings.
Wild-means things, indicating things and so on.
For example: what-what?
Give-give meaning
So "for you" is for you directly.
So the whole sentence is to tell you one thing, and adjusting the word order in Mandarin is to tell you one thing ~