When one person sucks liquid out of another person's mouth, like a water fountain.
Cindy: I took a sip of water, and then he just said "I'm thirsty", and gave me the human fountain.
by vdw17 February 12, 2019
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Someone who violently diarrhoeas and vomits at the same time, generally to the amusement and/or disgust of a nearby audience.
John had eaten bad food the night before the party so he had diarrhoea to start with. Then he drank too much at the party and started throwing up while taking a shit in the garden.

There was liquid shit and vomit everywhere and between his bursts of regurgitation, he kept yelling at everyone to help him, but everyone was too incapacitated by laughter to do anything for a good half hour.

And that, children, is the story of how John became known as the Human Fountain.
by TheInternetIsNotAlwaysReliable December 9, 2013
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When you puke a shit ton and look like a fountain
bro, he stuck his fingers in his mouth and did the human fountain
by Alofi February 26, 2022
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