熱臉貼冷屁股 [热脸贴－－－]

Jyutping jit6 lim5 tip3 laang5 pei3 gu2
Pinyin rè liǎn tiē lěng pì gu

Definitions (CC-CEDICT)
  1. to show warm feelings but meet with cold rebuke (idiom)
  2. to be snubbed despite showing good intentions