Uh-huh (interjection)

Used to indicate agreement or understanding.

Origin:

It is an informal, non-standard version of the word "yes" and it is likely to have originated in colloquial speech.

Examples:

1. Are you ready to go? Uh-huh.
2. Did you finish your homework? Uh-huh.
3. Did you like the movie? Uh-huh.
4. Do you want to go out for lunch? Uh-huh.
5. Will you be there at 7pm? Uh-huh.