What Chu Doing?

This sentence : " What Chu doing" keeping on playing in my mind since yesterday.

I was at home at the hall while my little niece was watching the channel nickelodeon - Phineas and Ferb. There is this other character in the show call ISABELLA (and my niece is called Isabel). Isabella kept saying this when she meets people " What chu doing" What chu doing" hahahahaha

This morning that's whats been playing on my mind and I kept repeating it over and over again verbally too. So CUTE!!!!

WHAT CHU DOING?! ( with a sing song tune)