WordNet
n. a highly energetic and indefatigable person [syn: powerhouse, ball of fire, fireball]
Usage examples of "human dynamo".
Ex-Marine Corps, all-around weapons expert, and a human dynamo, as gung-ho as any man in the Treasury Department, Fortuna was an expert in small unit assault tactics--at least in his own mind.
Overawed by this human dynamo, Ross was conscious of Falck's making some glib but respectful rejoinder and directing his body out of the office.
Boredom for not having anything real to do, and embarrassment because I had to sit there in the presence of Holly, the human dynamo, who probably got more work done accidentally than most people, particularly myself, did on purpose.
Looking at the weary remains of this once-human dynamo, I was sympathetic, almost sentimental.