Pig  —n. 1 omnivorous hoofed bristly broad-snouted mammal, esp. A domesticated kind. 2 its flesh as food. 3 colloq. Greedy, dirty, or unpleasant person. 4 oblong mass of metal (esp. Iron or lead) from a smelting-furnace. 5 slang derog. Police officer. —v. (-gg-) colloq. Eat (food) greedily.  buy a pig in a poke acquire something without previous sight or knowledge of it. Pig it colloq. Live in a disorderly or filthy fashion. Pig out (often foll. By on) esp. Us slang eat gluttonously. [old english]