Leviathan Share definition Flag Leviathan: The act of master bating while holding in a poop until the last possible second, so you cum and shit at the same time. After summoning my leviathan I slept for days Leviathan by Freakshow 650r June 12, 2018 0 0 Get merch Get the Leviathan mug. Buy Now — $32.95 See more merch