NKVO is an abbreviation for the Norwegian term 'nå koser vi oss', which translates to 'now we enjoy ourselves'.
Used to descripe a cozy (maby ironic) situation.
When someone enters your unlocked car, and uses the cigarette lighter to smoke in your vehicle, usually (freely) leaving the cigarette butt(s) and smoky smell as evidence.
Person #1: I have no idea why those cigarette butts came from in my ash tray...
Person #2: Haha, it looks like you and your car were getting poofed last night!