The idea that a fictional character is absolutely indominable and can accomplish anything, usually the result of horrible writing or 9 year old writing.

Its namesake comes from indestructible Tarrasque of dungeons and dragons fame, a monster that is famously known for its overpowered nature and association with bad storytelling.
Jimmy: Seriously X character is so overpowered!
Bob: The author probably has tarrasque mentality
by Alchemy Jug January 19, 2021
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