An inverted Motorboat. When a person sits on top of and rubs their breasts vigorously in another person's face while they make vibrating sounds. So named for the movie "The Poseidon Adventure" which takes place in an upturned cruise liner.
Lucy: Check out the bazookas on that little hottie!
Lara: I'd like to go on a Poseidon Adventure with her!

Chuck: I think Larry's Manboobs have gotten bigger.
Ben: I'll be he gives his Girlfriend a Poseidon Adventure every time they do it.
by chebizarro January 23, 2014
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Poseidon's Pitchfork is when a male is urinating and his stream starts, or leads into, a triple stream going left, right and center.
Oh man, I had to pee so bad last night, I made Poseidon's Pitchfork.
by AGills March 27, 2017
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Like Poseidons' kiss but worse, it's when a dick dips into toilet water.
Dude, your toilet water is way too high! I got Poseidons' BJ, not cool.
by HuskyDuder March 17, 2018
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The name of a threesome that involves only men.
Grey, Mike, and Nathaniel meet up last night to perform poseidon's Trident.
by BackB0ne April 19, 2016
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When you're sitting on a small toilet and you start to piss, the piss sprays back on you. Only happens for boys, or toilets with no water for girls eg: planes.
"The hotel in Romania had such a fucking small toilet bowl, pissing was like Poseidon Surfing.
"Any time I take a shit, Poseidon always decides to go surfing!"
by Lamb Sauce January 18, 2018
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When the shit hit the water and the water hits your coochie right on the lips.
Yeah I was just taking a shit and I got surprised by a Poseidon’s kiss
by Sursiq February 2, 2023
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The act of toilet water splashing up onto exposed asscheeks as a result of a large amount of feces dropping into the toilet.
Erik: Dude, looks like you got some swamp ass there!
Roger: Nah man, just Poseidon's Kiss earlier this morning.
by Funny Boner December 12, 2015
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