Grunt meaning : A short snorting sound, often to show disapproval, or used as a reply when one is reluctant to speak. The snorting cry of a pig. Any fish of the perciform family Haemulidae. A person who does ordinary and boring work. (United States Army and Marine Corps slang) An infantry soldier. The amount of power of which a vehicle is capable. A dessert of steamed berries and dough, usually blueberries; blueberry grunt. (of a person) To make a grunt or grunts. (of a pig) To make a grunt or grunts. To break wind; to fart.