羊質虎皮 [－质－－]

Jyutping joeng4 zat1 fu2 pei4
Pinyin yáng zhì hǔ pí

Definitions (CC-CEDICT)
  1. lit. the heart of a sheep in the skin of a tiger (idiom)
  2. fig. impressive in appearance but lacking in substance
  3. braggart