Full of beans

Finn: Welcome to The English We Speak. I'm Finn.
Feifei: I'm Feifei.
Finn: We've just had a fantastic meal.
Feifei: So full. How much did we eat?
Finn: Well, we started with a big pot of chicken soup, then some lovely Vietnamese fried spring rolls, a plate of gorgeous Polish dumplings, oh, and a huge steak, then half a pizza, some roast potatoes ... 
Feifei: Ooh, Finn stop ... 
Finn: ... fish pie, ooh and some sushi, that was nice ... mmm and ice-cream ... 
Feifei: Don't mention all that food! I'm so, so full. I'm exhausted. I need to sleep! (yawning)
Finn: Really? I'm full of beans!
Feifei: Beans? That's the one thing we didn't eat!
Finn: Oh yes, we didn't. Yes, well what I meant was—I'm full of energy. Full of beans is an expression meaning full of energy and enthusiasm. Isn't that right Feifei? Feifei? Hello?
Feifei: (snoring)
Finn: Well I think she's fallen asleep. While she rests, I'll play some examples ... 
Finn: Feifei?
Feifei: Oh hi. Where am I? What am I doing in the ... oh, we're in the studio. I was dreaming about beans.
Finn: I'm not surprised! Tell you what, why don't you just go back to sleep.
Feifei: (snoring)
Finn: (whispering) Ok, well hope you've enjoyed learning a new phrase today and that you're all full of beans! If you are, come and visit our website bbclearningenglish.com. Right, I'm off for a 10 km run. Full of beans, me. Bye!
Feifei: (snoring loudly)