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.
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.
by Lord-General Foamington January 23, 2018
A huge heap of turds that rise majestically above the toilet's water line that resemble the Thunderbirds island
by Roger Mellies arse October 13, 2022