To be full of beans means to be in high spirits: to be full of energy, health and enthusiasm.
Examples of use:
a) My children are always full of beans when they get up in the morning.
b) You're full of beans today!
Here are some more idioms based on beans:
1. To spill the beans is to reveal a secret or private information.
Example of use: My friend has spilt the beans and told everyone I work with that I have a new job.
2. Not to have a bean means to be penniless, have no money at all.
Example of use: I have spent all my money and now I don't have a bean.
Image © Stuti Sakhalkar