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Jyutping lou4 sung1
Pinyin lāo sōng

Definitions (Wiktionary)
  1. noun, Cantonese, derogatory
    Mandarin-speaking Northerners

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Jyutping laau1 sung1
Pinyin lāo sōng

Definitions (粵典–words.hk)
  1. 名詞、俚語、外來語、大陸
    廣東​人​對​北方​外省人​嘅​貶​稱​,​尤其​是​男性​;​源​於​北方​外省人​普遍​用​普通​話​稱呼​陌生​男子​「​老兄​」​(​l​ǎ​oxi​ō​ng​)​,​廣東人​因此​以近​音​嘅​「​撈​鬆​」​借代​稱​呼​佢​哋​;​構詞​方面​,​可以​因應​性別​、​年紀​,​將​「​撈​」​配上​唔​同​嘅​後​綴​,​例如​撈頭​、​撈​佬​、​撈婆​、​撈​仔​、​撈妹​等等​(​量​詞​:​條​/​個​)
    derogatory address by Cantonese to Chinese outside the north of Guangdong, especially males, phonetically similar to the etymological origin lǎoxiōng in Mandarin
Definitions (Kaifangcidian)
  1. 外省人
  2. 北方人
  3. 外地人

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Jyutping laau4 sung1
Pinyin lāo sōng

Definitions (CC-CANTO)
  1. a foreigner of Cantonese, one who speaks Mandarin but does not understand Cantonese, mostly use against Northern Chinese