full of beans


1

Lively, energetic, in high spirits, as in The children were full of beans today, looking forward to their field trip. This expression has no valid explanation. [c. 1840]

2

Also, full of prunes. Acting foolish, talking nonsense, as in One cup of coffee won't hurt you—you're full of prunes. [c. 1930] Also see full of crap.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.