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A female lets a male stuff a whole bunch of Mentos into her butt and then pours a whole two-liter of soda in there. It explodes in her guts like a dirty fireworks show and she lets him catch the mess in a cup and drink it like it's some kind of sick juice box.
My cousin did this in the school bathroom and got caught by the principal. She still says it was worth it.
My brother turned his girlfriend's poopshoot into a soda volcano and now they're married.
I tried this and my pants exploded. I still have the cup.