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Jyutping tit3 goek3 maa5 ngaan5 san4 sin1 tou5
Pinyin tiě jiǎo mǎ yǎn shén xiān dù

Definitions (CC-CANTO)
  1. one who does not feel tired or hungry (slang)
Definitions (粵典–words.hk)
  1. 語句
    做​偵查​記者​要​有​身體​強健​、​捱​得​嘅​特​質​:​鐵腳​即​係​要​頂​得​住​長​時間​企同​行走​、​馬​眼即​係​瞓​得​少​但​仍然​保持​精神​、​神仙​肚即​係​食無定​時​但​毫不​影響​表現
    to have the required qualities for an investigative journalist, i.e. strong physical stamina, good powers of observation and the ability to go without regular food; literally: iron legs, horse's eyes, fairy's stomach