When one has a really wet flatulence which leaves a slushy brown substance in ones undergarment.
Man you should change your boxers there is fart slush dripping down your leg!
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It’s that one shit, where it comes on so suddenly you know it’s going to be like hot diarrhea shots but you didn’t realized that the backsplash was gonna paint your inner thighs and escape the confines of the toilet bowl. Also known as the Jamaican Milkshake.
OMG! I can’t believe how many times I’ve had to clean the shush fart off the toilet seat. I hope grandpa realizes that he shit slush fart all over his inner thighs.