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Jyutping ngoi3 taa1 sei2
Pinyin ài tā sǐ

Definitions (Wiktionary)
  1. noun, Singapore
    MDMA; ecstasy
    (syn.) 揈头丸, 疯药, 狂藥, E仔, 狂药, 揈頭丸, 摇头丸, 衣服, 搖頭丸, 快樂丸, 快乐丸, 瘋藥