Yes, it is selamat makan. But what does it matter when the food is so good. (and there are so many different 'dialects'? 'languages'?)

I love the tahu telor and the ajam rudjak , not to mention the gadu gadu, the lontong and the sajur lodeh. Ikan Bali or ikan sambal goreng. And all the rest of it.
We don't have a word for the part between nose and mouth at all either, Ahmad.
Philtrum sounds very medical to me.