"Please, you have to wait, I'm working. I'll talk to you."
Here's a breakdown of the phrase:
* por favor: please
* tienes que esperar: you have to wait
* estoy trabajando: I'm working
* yo te ablo: I'll talk to you
The phrase conveys that the speaker is busy and asks the listener to be patient. They are indicating they will talk to them as soon as they are available.