Questions about example sentences with, and the definition and usage of "Overate"

A: we usually say “something is overrated” but overate is a word too!

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A: × She overate dinner, so she was getting a belly on her.
✓ She overate at dinner, so she started to get a belly on her.

"she started to get a belly on her" = becoming fat because her body is unhealthy. "Getting a belly" means "getting fat"

"her belly started to show" = her belly just looks fatter (because she has lots of food in her stomach)

A: I had a stomachache because I overate.

A: okay so I think you can say something like:

He ate too much food that his parents had to sell their house in order to pay for it.

A: "I eat a lot" sounds better or "I ate too much" for past tense. "I overate" ("overeat" for present) could be fine too.