Basically, like a bidet from hell.
"Always wanted to see what happens in my dishwasher after I close the door," writes YouTuber Bito, who shot this footage with a GoPro.
It bears mentioning that this dishwasher is on the older side. Newer models forego the gyrating hydro-phallus in favor of two or more rapidly spinning spray arms (à la). The spray arms are almost definitely more effective, but I think we can all agree this is way funnier: