Your favorite expressions/words in Japanese?

This may not even be a thing, but I have heard it in many Japanese dramas. I love how they pronounce coffee as kohee (kōhī). So cute. 

Daijoubu desu 

Saa - I don't know; who knows...

Mendokusai - It is bothering; not worth it...

Itadakimasu - Thanks for the food; lets eat...

Kawaii - cute

Isekai - another world (genre in anime and manga)

Eh? 

Eeehh!?

Eh.....

kawaii=cute

Ahoyana  

 Moonlight:

Seyade

What does it mean?

nandeyanen