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Jyutping oi3 mei5 san4 fei1 daan2
Pinyin ài měi shén fēi dàn

Definitions (粵典–words.hk)
  1. 名詞、香港
    源​於​日本​動畫​《​鐵甲​萬能俠​》​,​係​女主角​部機械​人​「​愛美神​」​嘅​招式​:​喺​胸前​發射​兩枚​飛彈
    the Oppai Missile System ("Oppai" being a Japanese slang term for "breasts") i.e. two missiles fired from the chest of Aphrodite A, the robot of the heroine in the 1972 Japanese amine "Mazinger Z" (or "Tranzor Z" in the United States)
    光子力ミサイル
  2. 名詞、香港
    由​上述​嘅​招式​聯​想到​女性​嘅​兩​乳​,​而家​時常​比喻​為​大​胸​嘅​女性​;​亦​作愛美​神導彈
    big-breasted female

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Jyutping oi3 mei5 san4 fei1 daan2
Pinyin ǎi4mei shén fēi1dan

Definitions (CC-CANTO)
  1. describes someone with a very big breast [colloquial]