Sale merde 

A "sale merde" is someone like Edouard Faesch or Xavier Gasser, people who are des sales merdes

Edouard est une sale merde, ca c'est sûr !

Sale merde by Hyuwasuto December 2, 2020

un sale rat de merde 

un sale rat de merde is basically a shitty human being, or a snitch. the biggest example is gaston, he's the rat king.

frr gaston c'est un sale rat de merde

un sale rat de merde by abdelkader smith jonson the 3r May 21, 2022