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Jyutping lou5 gaa1 si1
Pinyin lǎo jiā sī

Definitions (Wiktionary)
  1. noun, Min-Nan
    old fellow; old codger
    (syn.) 老家伙, 老契涸, 老趁统, 老釘釘, 老貨, 老钉钉, 老屁股, 老货, 老趁統