A sexual act involving two partners, a diving board, and a pool at least 7 feet deep. The receiving partner is in the water, with their orifice of choice facing upwards and above the water. The other partner climbs the diving board, jumps off, and penetrates the other in the water. Whether you hit or miss, this is guaranteed to be quite an experience for both of you.
"Babe, I love you and all, but I wanna spice things up, sexually."

"You want spice? I will give you Poseidon's revenge with full force, how's that for spice?"
by nochilliam August 28, 2016
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Guy 1: What is with him recently?

Guy 2: He's been doing a lot of drugs, caught crabs and has Poseidon's Disease.

Guy 1: That explains why he's getting stupider
by MamboNZ April 8, 2009
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When you take a dildo up the ass that has been submerged in toilet water
Person 1: hey bud have you heard of a Poseidon’s kiss?
Person 2: yeah
Person 1: well this is a Poseidon’s hickie!
Person 2: *screeching*
by Poseidon’s Hickie December 4, 2020
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Cocaine mixed with crushed ecstasy
I had some Poseidon Powder at that party and it was wicked
by Dubiks January 25, 2019
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Yo, I just got some cheap Poseidon’s powder we can snort
by CMB Talon January 15, 2019
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The act of taking a heavy shit and upon the load hitting the water it splashes up on to your arse
Christ that Poseidons kiss was cold after my morning shite
by Zack_0700 June 22, 2018
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Water splashing up so fiercely from the tpilet bowl due to defecating, that it penetrates your butthole.
I dumped a log so solid it gave me a fierce poseidon's pash.
by BrownDoggyDog April 7, 2018
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