What is the definition of Greatly Infection?

"Greatly infection" is a hilariously misplaced term that literally means to spread an infection of joy, but with the twist of it being a viral meme or internet sensation that's so contagious, it infects your mood. Think of it as the digital equivalent of a super-spreading event, but instead of germs, you're sharing a laugh.

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Now, here's an unsettling example sentence: "The once unbeatable team's 'greatly infection' rally cry now turns their locker room into a makeshift comedy club, where the jokes are 'greatly infection' and the audience is the entire town."