Kai was trying to annoy Turtle in the car by copying everything she was saying. She was getting upset and told on him but then she thought about it.
Keely: I'm stupid.
Kai: I'm stupid.
Keegan: I tupid.

Keely: Yep, that's what I am!
Kai: Yep, that's what I am!
Keegan: Yep, I am!