小姑奶奶 [－－－－]

Jyutping siu2 gu1 naai4 naai2
Pinyin xiǎo gū nǎi nai

Definitions (Wiktionary)
  1. noun, colloquial, derogatory, endearing, sarcastic
    Term of address for a girl or young lady who is overbearing and hard to please.
  2. noun
    the youngest sister of one's paternal grandfather