Can’t Find A Big Enough Word

(I am having a conversation via Skype with a friend in Japan. I am very bad at speaking Japanese and she is almost as bad at speaking English. We’re hoping to exchange languages. I have asked her whether Japanese people think that American people are emotional.)

Friend: “Yes. Japanese people think that American people are…”

(She keeps repeating a Japanese word that I do not know. She cannot think of the English word for it. I see her start to type, obviously looking for a translation online.)

Friend: “Americans are…” *muffled English word*

Me: “What?”

Friend: “Americans are bigger!”

(I burst out laughing but hold my tongue, hoping that she does not mean it that way. She finds another translation):

Friend: “High-energy.”