Meaning
To eat so much you're uncomfortably stuffed.
Example
No almoço de domingo da vó, comi que fiquei triste.
At Grandma's Sunday lunch, I ate so much I could barely move.
Origin
A jokey regionalism from Ceará (Northeast Brazil), recorded in local dialect glossaries: the humour turns on the literal "fiquei triste" ("I got sad") standing in for the heavy, sluggish discomfort after overeating.
Sources: Dicionário Cearês, Dicionário do Dialeto Cearense.
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