To become enraged in an imposing or intimidating manner.
"Now," Mr. Gaunt said. "Let me give you a few directions, Ace. And remember what I said: I want you back by midnight. If you're not back by midnight, I will be unhappy. When I'm unhappy, I sometimes lose my temper. You wouldn't want to be around when that happens." "Do you Hulk out?" Ace asked jestingly.
To gain significant muscle mass from exercise.
One of my best friends has hulked out his chest, triceps and shoulders exclusively with weighted push ups at my recommendation.
From Hulk, a fictional character, created by Stan Lee and Jack Kirby for the Marvel Comics Universe, who gains superhuman strength when he becomes angry.
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