bounce something off someone..ok shoot!

[Theseus]

bounce something off [someone] Fig. to try an idea or concept out on someone or a group. Low register expression.
--Let me bounce off this idea, if I may?
--Can I bounce something off of you people, while you're here?
--O.K. shoot!/fire away!
[If you want to ask someone a question and they tell you to 'fire away' or 'shoot!, they mean that you are free to ask what you want/ 'go ahead' is the phrase in a higher register].

 

[Palavra]

You'd say «να σου πω μια ιδέα να μου πεις τη γνώμη σου;» or something similar, I think.
[For shoot! fire away! you could say «ρίχ' το/ριχ' την»]

 

[nickel]

In addition, for Shoot! Για πες! Some people write: Γιά πες! (To distinguish this για from για "for" and also to show it is stressed.)