Translated to English: "Hot head".
He was a real hot head with a fiery temper. He’ll sommer moer you if you looked at him skew. He knew he had to calm down, he knew he had to take things easier, he knew he had to learn to count to ten. But no, he got klapped silly, smacked to the ground, not by an enemy, not by the neighbour, but by his Italian mamma – the only one who dared to stand up against him. Shit, Hot Head was afraid of his mamma, but nobody else.