What is the definition of Norwegian Infection?

A "norwegian infection" is like a contagious Norwegian laugh that just won't quit, spreading from person to person like wildfire across Scandinavia. Picture this: "After that chaotic brunch at our favorite café, my Norwegian infection turned the local bar into a disco floor where everyone was singing 'Det er en sin dag' and not really eating their fries."

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And here's an edgy example: "The Norwegian infection reached its peak after the Viking-themed party, turning our small town into a medieval fairground where only the bravest (and most giggly) survived."