Oh, if only you could boss fires round like dogs...sadly, 'tis not to be.
Meaning[]
It means, "OK, I'm ready for whatever it is you have to say."
Use in Normal Speech[]
If someone has something to say but is saying nothing.
"Go on, you look like you're ready to burst. Fire away."
As a request for quetions.
"OK, what d'you want to ask me? Fire away, I'm ready."