It's when one has their significant other drink/eat laxatives, and perform anal sex until you feel the pressure, then when you do pull out fast and move. That is how you do the Montana Mud Rocket
"Dude Sally and I performed the Montana Mud Rocket"
"Bro that's gross"
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A glorious man who is a God walking amoung mortals, he is the best friend anyone could ask for, can be weird in a good way, he is the God of Jokes, the best guy to have around