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When you eat a girl so fast and hard her insides scream and she ends up in the hospital because she can't stop squirting. It's like your tongue is a jet engine and it goes five times the speed of sound.
My cousin got mach fived and had to wear a hospital gown for a week.
I saw a guy mach five his girlfriend and the nurse had to mop the floor.
My mom said she got mach fived by a guy who looked like a hot dog.