Literal translation
to have cheeks like a poor man's backside
Meaning
to have plump, rosy cheeks
Explanation
Two opposite meanings coexist depending on how one pictures a poor man's backside. The more common one, having nice round fresh cheeks, comes from the idea that a poor man works standing up and never wears his seat thin from sitting. The rarer one, having hollow cheeks, assumes instead that he does not eat his fill. In Provençal, gauto means both cheek and, in the phrase gauto dóu cuou, buttock, hence the natural slide of the image.