This is the 10350th most frequent Swedish word.
jättebra
Very good.
Here, 'jättebra' is used as an adjective to express high quality and appreciation.
Din presentation var jättebra!
Your presentation was excellent!
In this instance, 'jättebra' describes the quality of the food to emphasize its excellence.
Restaurangen serverar jättebra mat.
The restaurant serves excellent food.
Here, 'jättebra' modifies 'idé' (idea) to emphasize its cleverness or appropriateness.