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

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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 !