When one decides to pass gas from their anus and it happens to be slightly moist, elaving a brownish spray of poo in their panties.
Named after Benny, who did the wettest farts in the world. Can also be shortened purely to Benny
when you hold in so many farts and they DONT go away so when you finally let it out its like 2 minutes long of a long,loud fart but it has absolutely NO SMELL AT ALL becasue its 100 percent air.