fettnais

Etymology
The first part fett is similar to Swedish slang also common in Norwegian. The second part nais is from.

Adjective

 * 1)  very nice, cool
 * 2) * Han kjøpte ei fettnais jakke førre veka, så det er ikkje så rart at han er blakk no då veit du
 * Last week he bought a very nice jacket, so it's not so weird that he's penniless now y'know

Adverb

 * 1)  very good

Interjection

 * 1)  very good