"Zrób mi obiad."

Translation: Make me lunch.

[Katinzahat]

Prosze?

[AdelaideDu8]

That's what I was thinking too - Proszę.

[too rough an imperative without the please].

[Jellei]

Well, it's surely not polite, true. Unless something else in the context makes it more polite, of course.

[chce_polski]

Make it yourself! I'm not your slave!

[Aran.Nelske]

Jesteś obiadem.

[Lord_Pengwyn]

Szybko!!!!

[Tim5602]

Would 'rób mi obiad' mean the same as 'zrób mi obiad'?

[Jellei]

Not really. It puts the emphasis on the process, but you'd probably prefer the dinner to be actually prepared til the end, right? And that needs the perfective "zrób".

"Rób" can also have the general meaning, meaning of regularity: "Rób mi obiad codziennie" - "Make me dinner every day".