A fertada
A fertada is someone who eats like a pig but still can't finish their plate. They're basically food waste in human form.
My cousin ate three burgers and still said he was full. Classic fertada.
She ordered a pizza and only ate one slice. The rest went to the dog. Total fertada.
He brought a whole cake to the party and only ate a bite. That's a fertada if I've ever seen one.