The thick layer of fat between the skin and muscle layers of whales and other marine mammals, used for insulation and energy storage. The whale's blubber helps it to survive in the cold ocean waters.
Excessive body fat in humans, often used informally or humorously. After the holidays, he noticed a bit of blubber around his waist.
Noisy, uncontrolled crying or sobbing; weeping, especially by a child. Stop your blubber and tell me what's the matter.