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when?[/quote:1gtmj5f8]
Когда нервничаешь или волнуешься, особенно в ожидании чего-то.

To me too. I'm a Russian native though.[/quote]
It's just an attempt to explain an English expression "butterflies in the stomach" (which doesn't exist in Russian, obviously), assuming that the...

Бабочки в животе - это когда... = Вutterflies in the stomach - it's when...