Red-Blooded American

"Why do people call themselves 'Red-Blooded Americans'?"

"What do you mean?"

"I just don't know what it means."

"It's just an expression. I think it means you're average. I don't know."

"I kinda understand that part, but all blood is red if you're a human. It makes no sense. I can't say it's any other color. I can't be a blue-blooded American. Or green or yellow or black."

"I guess."

"Hm.."

"Well the red part could maybe stand for something, like vigor, strength, down-to-earth."

"I think it means you need to learn more adjectives."