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Fellatio while in the ocean.
Guy 1: While in Mexico, I met this girl and she gave me head in the Ocean!

Guy 2: Nice! Nothing beats a blocean!
by Last Laugh July 13, 2011
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To give and/or receive oral sex whilst in the ocean, at a depth where neither parties feet can touch the bottom, utilising no floatation devices.
This gnarly chick gave me the best blocean after my sunrise surf this morning, I was stoked!
by GavinGoodtime January 04, 2015
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