noun, feminine/mɛʁ.daj/plural: merdailles
a group of irritating children; a group of contemptible & inferior people; scum; a contemptible individual
“Et les trois commères de s’en aller, rouges comme nuit de noces, resserrées du bas et moquées par toute la merdaille.” — And the three gossips left, red like a wedding night, tight at their bottoms & mocked by all the little shits.
From merde with the suffix -aille.