full of beans
full of beans {adj. phr.}, {slang}
1. Full of pep; feeling good; in high spirits.
The football team was full of beans after winning the tournament.
The children were full of beans as they got ready for a picnic.
2. also full of prunes
Being foolish and talking nonsense.
You are full of prunes; that man's not 120 years old.
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Source: A Dictionary of American Idioms
