Stirred up, aroused with ardor, excitement, anger, or other strong emotion, as in She was all steamed up about the results. The precise meaning depends on the context. [Colloquial; early 1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.