What is the definition of Galaxy Infection?

A 'galaxy infection' is like when a space buffet gets out of control and starts serving cosmic miso stir-fries to all the stars, causing a celestial pandemonium of confusion and chaos. But let's keep it PG-13, shall we?

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Here's an edgy example: "After the galaxy infection, Orion's bust station started offering interstellar hot dogs that could make you question whether you're a good-looking, well-fed celebrity or just a lonely intergalactic ghost."