A loud fart on the toilet that usually results in a highly accelerated poop shooting into the toilet.
Someone's playing the poop tuba in stall number two.
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when your eating out an ass, but it smells frightful and looks like it's been stretched out and wrinkled. A poop tuba is generally caused by forgetting to shower. Only fucking retards are known to have poop tubas because everybody showers before sex.
I ate out a girl butthole last night, but she had a real stinky poop tuba. Never gonna fuck her again.
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