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When you pull your pants down just enough to let out a fart and then grab the smell with both hands like it’s a hot dog and throw it at your enemy like you’re a wizard who smells bad.
My cousin did the Hadookie during a family dinner and made my aunt pass out.
I did the Hadookie in the middle of a math test and got sent to the principal’s office.
At the gym, I did the Hadookie to my friend and he ran out screaming.