"Uh-uh" means "no". Here are some examples of how to use it:

A: You told me that you were going to take me with you.

B: Uh-uh. I never said that.

A: Have you seen my jacket?

B: Uh-uh.

"Uh-uh" is a casual phrase, and not common in written English.

This phrase appears in these lessons: