"I want to eat something good."
Translation:Chcę zjeść coś dobrego.
"coś" requires a form that ends with -ego. Whether it's Accusative or Genitive, I'm still not sure. Probably Genitive, as 'coś' itself is neuter and for neuter, only Genitive ends with -ego.
it's always neuter. but for some reason nominative and accusative of something+ adjective, are
coś+ adjective in genitive
While it's not impossible, that would suggest that I want to eat something good... all the time? And especially with 'something', this sentence really sounds like what you wish to eat right now.