Slop  —v. (-pp-) 1 (often foll. By over) spill over the edge of a vessel. 2 wet (the floor etc.) By slopping. —n. 1 liquid spilled or splashed. 2 sloppy language. 3 (in pl.) Dirty waste water or wine etc. From a kitchen, bedroom, or prison vessels. 4 (in sing. Or pl.) Unappetizing weak liquid food.  slop about move about in a slovenly manner. Slop out carry slops out (in prison etc.). [old english]