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Stands for High Altitude Fart Explosion. When you fly from a low place to a high one, your butt lets out a fury of farts so strong, it could knock out a whole row of passengers. Also known as HAMF, Hot Ass Mountain Fart.
My airplane seat neighbor turned into a human fart machine during the flight. I got a free meal from the flight attendant.
I flew from sea level to Mount Everest and my pants were on fire from all the farts.
My dad flew to Denver and farted so loud, the plane started shaking like it was in a war.