"Bruk hodet!"

Translation: Use your head!

[General5409]

But I don't wanna use my head!

[Deliciae]

Too bad; you just did. ;)

[PannasOwen]

He didn't use his head, he used his brain :D

[Burd1e]

Is "dine" just implied?

[Eternal_Mirth]

I think it'd be "ditt", and yes I've noticed in certain Norwegian it can be applied if not present.

[duolingoHepCat]

Does this mean "Think!" the same as in English?

[fehrerdef]

usually. But of course you can use your head for doing other things as well, in English speaking countries as well as in Norway :-)