How do you say yummy?

"Yummy" is already a word in English! It's a slang term for delicious, so you don't need to say it any differently.

However, if you're looking for other ways to express the same feeling, you could use:

* Delicious

* Tasty

* Scrumptious

* Delightful

* Appetizing

* Mouthwatering

* Savory

* Superb

* Wonderful

* Excellent

* Great

You could also use more informal expressions like:

* Mmm

* Oh my!

* This is good!

* I could eat this all day!

The best way to say "yummy" depends on the context and your personal style!