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Jyutping dong3 hau2
Pinyin dāng kou

Definitions (Wiktionary)
  1. noun, colloquial, regional
    at a specific time; this very moment
  2. noun, Shanghainese-Wu
    on the tip of the tongue

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Jyutping dong1 hau2
Pinyin dāng kǒu

Definitions (CC-CEDICT)
  1. at that moment
  2. just then
Examples (Tatoeba—Mandarin-English)
  1. Mandarin
    她非常想当口译。
    她非常想當口譯。
    tā fēi cháng xiǎng dāng kǒu yì 。
    • She has a strong wish to work as an interpreter.