How to say 'Eat well/Have a good meal.' in Korean?
(casual/informal) towards close friends

Question

Answer

To say bon appetit in Korean, it would be 맛있게 모고 ("Mashike mogo")

That was one of the first Korean phrases I learned, but I also found a YouTube video showing you how to pronounced it :)
https://www.youtube.com/watch?v=_mSy4A0cYEQ

Answer

'Eat well / Have a good meal.' => 맛있게 먹어 / 많이 먹어.

- 맛있게: adverb of 맛있다(delicious).  means "enjoying it", "with gusto/relish", etc.  
- 먹어: imperative of 먹다(eat), so it is just "eat!".
- 많이:  literally "in good quantity; a lot", but really means "heartily, as much as you like".

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