The phrase is everyday German, with heyyy stretched for comic effect before the blunt statement of disappointment that follows. Short German voice clips like this circulate on soundboards and in chat groups because the meaning is clear even from tone alone. Non German speakers also use it as a reaction sound, since the flat delivery signals a letdown without needing translation. It stays popular for small everyday failures, broken promises and underwhelming reveals, where an exaggerated but friendly complaint fits better than real anger or sadness.