This is the 9872nd most frequent French word.
fesses
Buttocks.
In this sentence, 'fesses' is used to refer to the anatomical part of the human body, the buttocks.
Elle a des douleurs aux fesses après avoir couru.
She has pain in her buttocks after running.
Here, 'fesses' is used in the context of physical activity, emphasizing the body part used involuntarily while sliding.
Les enfants glissent sur leurs fesses en bas de la colline.
The children slide on their buttocks down the hill.
In this usage, 'fesses' conveys a metaphorical message advising against idleness, tying the literal act of sitting to a figurative meaning.