帽子叔叔

màozishūshu
(slang) police officer

CEDICT

slang

Entry Composition

1 帽子 màozi
  1. hat
  2. cap
  3. (fig.) label
  4. bad name

classifier: 頂
2 叔叔 shūshu
  1. father's younger brother; paternal uncle
  2. form of address used by children for a male one generation older