"Ne vedem mâine, fetelor!"

Translation: See you tomorrow, girls!

[theactualjase]

How come girls is in dative (or genitive?) here? Wouldn't it be in accusative as the direct object of 'to see'?

[potestasity]

It's actually in the vocative case, because it's something addressed directly, not the direct object of "to see". but it does have the same form as in genitive/dative.

[Sadlo2]

Should "we will see you tomorrow, girls" be correct as well? If not, why not?