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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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