When you shit so much that it rises in a cone-shaped pile above the water in the toilet bowl.
Philip: "I ate so much El Pollo Loco this morning that I just made a volcanic island... it almost made contact!"
by ReekRend2 February 27, 2010
A quantity of feces the consistency of wet cement that piles so high that the peak of the mound breaks the surface of the water creating an island.
Man, that burrito from last night turned into a volcanic island this morning.
by Buckky Satan January 22, 2014