full of beans

The Virgin and the Gipsyの姉妹は友達とドライブに出かけます。
So the young people set off on their jaunt, trying to be very full of beans. They could really do as they liked. And so, of course, there was nothing to do but sit in the car and talk a lot of criticism of other people, and silly flirty gallantry that was really rather a bore.
今日は上に出てきた "full of beans" を覚えたいと思います。
・Collins English Dictionary: a.full of energy and vitality: The more George ran out of steam, the busier and more full of beans Alice seemed to get.; The rupee is headed south, and the stockmarket isn't exactly full of beans.
・Wiktionary: Energetic and enthusiastic: Full of beans, full of life, gung-ho, fearless, tenacious at anything he attempted.
なるほどと思いました。しかし、"full of beans" には次ぎの意味もあるのです。
・McGraw-Hill Dictionary of American Idioms and Phrasal Verbs: full of nonsense; talking nonsense. Oh, shut up, Mary. You're full of hot air. Don't pay any attention to Bill. He's full of beans. My English professor is full of bull. You're full of it.
・Dictionary.com: a. energetic; vigorously active; vital: He is still full of beans at 95. b. stupid; erroneous; misinformed.
小説でもたしかに車の中での元気な会話はくだらない内容の様子ですね。