English

Noun

pet rock ‎(plural pet rocks)

1. A rock one keeps and cares for as if it were a pet, often purchased as a novelty item and treated, with humorous intent, as if it has needs like those of a living animal.
   • 2015, Toby Fox, Undertale (video game)

     Papyrus: This is my brother's pet rock. He always forgets to feed it. As usual, I have to take responsibility.

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