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Jyutping jam6 lou5 mou2
Pinyin nèn lǎo mǔ

Definitions (Wiktionary)
  1. phrase
    Used other than figuratively or idiomatically: see 恁, 老母 (lǎomǔ).
  2. phrase, Min-Nan, slang, vulgar
    Abbreviated from 姦恁老母/奸恁老母, which literally means "fuck your (old) mother", but is usually translated as "fuck you".