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Jyutping gong2 zan1
Pinyin gǎng zhēn

Definitions (Wiktionary)
  1. adv, Mainland-China, Mandarin, neologism, slang
    to tell the truth
    (syn.) 讲真, 講真
Examples (粵典–words.hk)
  1. Cantonese
    古键琴系香港真系好少人会去弹。
    古鍵琴係香港真係好少人會去彈。
    • There are very few people playing harpsichord in Hong Kong.