What is Montana Milkshake?
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1. When you give a girl laxatives then you butt fuck her and she poops on your dick and you slap her in the face with your shit covered penis
Guy 1: Dude, PJ and Ginna did a Montana Milkshake at my grandma's house
Guy 2: Dude, thats disgusting
Guy 1: Yea, but Pj said it felt kinda good
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2.
Close cousin to the Cincinnati Juice Box, except the man releases a load of ejaculate into the woman's anus and proceeds to slurp the creamy mixture out with a bendy straw.
Dude, I totally gave Kevin's mom a Montana Milkshake. Mmmm Mmmm Good.
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A slap across the face using an erect penis.
Cindy was just about to blow me when I gave her a vertical slap.
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laughing my ass off so fucking hard its not even funny
Selah: dude u totally should do it! (holding up a GO SHANE!! sign, face painted ..