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わっ

わっ, ワッwa

interjection

  1. boo! (sound used to scare someone)
  2. ugh (dissatisfaction, aggravation)
  3. ulp (consternation)

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Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences