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When you are laying in a bath and you poke your bellend up through the waters surface, creating a small 'island' of bell.

You then proceed to rub the base of your penis slowly so as to not to create waves, and shout "Thunderbirds are go!" as you ejaculated.
"Sorry I was late to dinner, I was giving myself a Tracey Island before I got dressed."
via giphy
by Lord-General Foamington January 23, 2018
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