More into detail what nerf gun waterfalls is: You know how water squirts out of water guns? Well now the hole were the water squirts out is your butthole except now shooting out powerful diarrhea.

“ dude fuck, I just had some nerf gun
waterfalls in my grandmas toilet! It’s so messy and smelly AF! Bro my grandma is gonna die like twenty years earlier because of this smelly ass!”
by Hey bob yo yo boy March 18, 2019
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