This is the 9872nd most frequent French word.
fesses
Buttocks.
In this usage, 'fesses' conveys a metaphorical message advising against idleness, tying the literal act of sitting to a figurative meaning.
Ma grand-mère disait souvent : 'Il ne faut pas rester assis sur ses fesses toute la journée.'
My grandmother often said: 'You should not sit on your buttocks all day.'
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.