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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.
CC BY-SA 3.0
2011-07-30T19:24:50.290
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2013-03-20T14:39:03.343
2011-12-29T06:04:11.413
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question
meaning puns
What is おやすみNASA胃？
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.
CC BY-SA 3.0
2011-07-30T19:56:34.153
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2011-07-30T19:56:34.153
558
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answer