If something is scrummier, it is more delicious or more attractive.
Scrummier is a fun and happy word. It makes people think of yummy food or nice things.
Examples:
The cake looks scrummier than the cookies.
I think the new dress is scrummier than the old one.
The ice cream is scrummier than the broccoli.
The scrummier the food, the happier I am!
I wish I could eat scrummier food every day.
The scrummier the cake, the bigger the smile on my face!