1
general::
A dynamic, energetic, and successful individual, as in I hope Pat joins us; she's a real ball of fire. [Slang; early 1800s]
American Heritage Idioms
2
general::
Phrase(s): ball of fire [and] fireball
an energetic and ambitious person; a go-getter. • That guy is a real ball of fire when it comes to sales. • I don’t want to hire some young fireball. I need wisdom and thoughtfulness.
McGrawhill's American Idioms And Phrasal Verbs