Bilge meaning : The rounded portion of a ship's hull, forming a transition between the bottom and the sides. The lowest inner part of a ship's hull, where water accumulates. The water accumulated in the bilge, the bilge water. Stupid talk or writing; nonsense. The bulging part of a barrel or cask. To spring a leak in the bilge. To bulge or swell. To break open the bilge(s) of.