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The thing is, Thick started as Thick Thighs, normally seen on curvier, but still to a respectably healthy level, women.
Then, /d/ fags started clinging to the term like they took chubby, fat, belly, stuff like that, and started using it for another level of landwhale, where Fat=Unable to move even your wrists and fingers, Chubby=barely mobile, and Thick ended up being "capable of a full range of motion but still being classified as ridiculously overweight."
No matter what society comes up with for a term for a curvy woman, /d/'s fat fetishists will corrupt it on 4chan to a degree where it looses the attractiveness to people who like the original level described.
Pic related, but spoilered.
