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Take a guy's butt hole or pecker and stuff a funnel in it. Pour water, crushed red peppers, and cumin down his pipe and let him swirl it around for a few minutes. Then make him blow his load like a Mexican sneeze. It’s also a way to insult someone.
My uncle did this to my dad and it made him cry like a baby.
My friend tried this and he peed his pants.
I did this to my teacher and he got suspended.