What is the definition of Legacy Infection?

A 'legacy infection' is like a sneaky, old-fashioned germ that's been around for way too long, lurking in the shadows of our modern lives, causing more chaos than a clown at a funeral. It's the kind of infection that's been passed down through generations, living on in the collective memory like a bad episode of 'The Office,' but instead of being just a grumpy coworker, it's a full-blown, nostalgic nightmare.

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Here's an unsettling example sentence: "The legacy infection of '80s nostalgia still lingers, causing my grandma to insist I eat her old, rancid avocado toast every morning like it's some sort of superhero power-up."