Grunt/ɡrʌnt/ Definition 1 of 5Pro Tip 1/2Animal Sounds Used for the peculiar sound that pigs make; can suggest a messy or greedy context. He eats like a pig, always with loud grunts. Pro Tip 2/2Express Discomfort Can imply dislike or discomfort when describing a person's sound, like a complaining noise. She grunted in displeasure when asked to clean her room.