貓膩 [猫腻]

Jyutping maau1 nei6
Pinyin māo nì

Definitions (CC-CEDICT)
  1. (coll.) something fishy
  2. shenanigans
Definitions (Wiktionary)
  1. noun, Mandarin, colloquial
    underhanded activity; something fishy; trick
    • 這裏一定有貓兒膩。
      这里一定有猫儿腻。
      zhè lǐ yī dìng yǒu māo r5 nì ．
      There must be something fishy going on here.
  2. verb, Mandarin, colloquial
    to make mischief; to play a trick
Definitions (兩岸三地生活差異詞語彙編—Two Shores Three Places)
  1. 日常用語：臺
    詭計
  2. 日常用語：陸
    貓膩