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When you rip a fart and your ass cheeks are blocking any exit pathway for the fart. Forced to go somewhere, the fart exits forward in direction and vibrates your ball sack as well as heats it up.
That sack steamer just vibrated my nut sack
When a male farts, and the fart travels through his gooch, and then upwards towards his balls. Thus giving him a disgustingly warm and smelly sensation.
Guy 1: Dude, I was sitting down in class and couldn't hold it in my fart anymore so I ended up farting and it gave me a sack steamer.
Guy 2: Ugh man, those feel so warm yet so gross.