throbbing manroot Share definition Flag a large, if not colossal, penis that always pleasures women, or men, while grounding itself deep inside. His throbbing manroot tore me the f**k up. throbbing manroot by Eblis Anbu Cain January 19, 2010 0 0 Get merch Get the throbbing manroot mug. Buy Now — $32.95 See more merch