Something, especially any type of food or physical situation, that can more readily make your ass pass gas.
I did some fart wrenching exercises, and then ate a fart wrenching dinner before watching a fart wrenching movie.
An event, typically of a rather stinky nature, that causes sadness and despair but is more ironic than genuinely depressing.
Damn dude we lost the clan war, that’s fucking fart wrenching.