What is おやすみNASA胃？


I've seen this in several places. Is that a set phrase? What does that mean?

I know that it's a way of saying "Goodnight," but the NASA胃 doesn't make
sense.




胃 is read い and NASA reads "なさ" so what this actually says is おやすみなさい ("Good
night"). However, I don't know wether this is a typo or an intentional
misspelling.




胃 is read い and NASA reads "なさ" so what this actually says is おやすみなさい ("Good
night"). However, I don't know wether this is a typo or an intentional
misspelling.

