Top Definition
The sneaky jellyfish is performed in a hot tub with other people in it. You discretely rub one out and let it float around. Sooner or later the cum will stick on someones chest.
Girl: "Ahh this hot tub is so relaxing"
Guy: "Yeah it is,but what is that on your chest"
Girl: "Ewww I dont know its really sticky..."
Guy: "Hahaha looks to be none other but the sneaky jellyfish!!!"
by Jeremy.S.6969 April 10, 2008

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