hot-blooded man; passionate man
Refers to a man who is enthusiastic, passionate, and full of fighting spirit. Often used in a positive, admiring sense, especially in sports, shonen manga, or motivational contexts. Similar to 熱血漢, but 男児 emphasizes a youthful, boyish vigor.
See also: 熱血漢
He is truly a hot-blooded man, facing any difficulty head-on.
That passionate coach always gives fiery speeches to his players.