why does she say "etsu"?

That's a small 'tsu' you're seeing there. It's quite common to see a small 'tsu' being used at the end of a short or partial word to indicate an abrupt cut-off, much like how hyphens would be used in English.

So it's actually more like "eh-... eh-...?"

i'd say there's more wrong here than a wardrobe_malfunction >_>;

someone's never been to the internet before