祖媽 [－妈]

Jyutping zou2 maa1
Pinyin zǔ mā

Definitions (Wiktionary)
  1. noun, Hokkien, Mainland-China, vulgar
    another's great-grandmother (usually referring to the speaker to insult someone)
  2. noun, Min-Nan
    great-grandmother (particularly paternal grandfather's mother)
  3. noun, Taiwanese-Hokkien, Zhangzhou
    female ancestor