We sometimes say this when someone (usually a small child) has lots of energy.  We use it in a positive way and we mean that they are very lively, which is a good thing.

You’re full of beans today.  You’ve been working for hours.

My children got up at 6 am this morning and were full of beans.

Aren’t you tired after your long flight?  You seem full of beans!

 

 

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