full of beans

adjective2

1. •
   Energetic and enthusiastic.

   • "What do you mean by the expression 'Bucks you up'?" "Well, makes you full of beans, you know. Makes you fizz." "I don't understand a word you say. You're English, aren't you?" — 1919
2. •
   (US) Incorrect; uninformed; exaggerating or expressing falsehood.

   • Anybody who tells you that they know what today's readers want is full of beans. — 2008