齒頰生香 [齿颊－－]

Jyutping ci2 gaap3 sang1 hoeng1
Pinyin chǐ jiá shēng xiāng

Definitions (CC-CEDICT)
  1. lit. to feel the taste in one's mouth (idiom)
  2. fig. to water at the mouth
  3. to drool in anticipation