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.

Meaning

• (of a person) To make a grunt or grunts.

• (of a pig) To make a grunt or grunts.

• To break wind; to fart.

  "Who just grunted?"