assleviathan Share definition Flag someone who is so mind-numbingly assholish it can only be descibed in the biblical sense. Jeebus! Bradley is all assleviathan today! Run! the four whores-men of buttbaggery are coming next! assleviathan by mikeyd1978 October 22, 2011 0 0 Get merch Get the assleviathan mug. Buy Now — $32.95 See more merch