Purple

Purple is a synonym for the word silly. Silly typically means foolish, but it's now used as a word that just means, well, silly.

"You're so purple."
"No, you're silly!"

Purple

Synonym for silly.

“You’re such a silly billy! You two are so purple when you’re around each other.”

“Do you have ADHD?”
“I don’t think so. I’m just really purple.”