[--]

Jyutping hak1 gam1
Pinyin kè jīn

Definitions (Wiktionary)
  1. verb, Mainland-China, informal
    to pay a premium in a freemium game, in order to buy virtual goods, additional functionalities, etc.
    (syn.) 課金, 课金

氪金 [--]

Jyutping
Pinyin kè jīn

Definitions (CC-CEDICT)
  1. to make an in-app purchase in a game
Examples (Wiktionary)
  1. Mandarin
    一天氪金一千大洋?你可能是石乐志。
    一天氪金一千大洋?你可能是石樂志。
    yī tiān kè jīn yī qiān dà yáng ? nǐ kě néng shì shí lè zhì .
    • You spent 1,000 bucks on this game in a single day? You must be losing your mind.