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A fake Norwegian goodbye that only smartass kids who think they're fancy use. It sounds like it's stuck between English and Norwegian, like it got kicked out of both languages.
'Hadet hadet!' he said, like he was trying to be cool at the lab party.
She said 'hadet hadet' and then tripped over her own feet.
He used 'hadet hadet' to end a text to his ex, who was still mad about the lab fight.