掇臀捧屁

duōtúnpěngpì
  1. to hold up buttocks and praise a fart (idiom); to use flatter to get what one wants
  2. to toady
  3. boot-licking

CEDICT

to toady; to brownnose

Wiktionary

諂媚，奉承

維基詞典

Entry Composition

1 掇 duō to pick up; to collect; to gather up
=2 臀 tún buttocks; hips; rump
=2 臀 tún old variant of 臀 tún
3 捧 pěng
  1. to hold or offer with both hands
  2. to sing the praises of
  3. classifier for what can be held in both hands
4 屁 pì
  1. fart
  2. flatulence
  3. nonsense
  4. (usu. in the negative) what
  5. (not) a damn thing

Related entries

溜鬚拍馬 liūxūpāimǎ
  1. to smooth whiskers and pat a horse's bottom (idiom); to use flatter to get what one wants
  2. to toady
  3. boot-licking
阿諛 ēyú
  1. to flatter
  2. to toady
馬屁 mǎpì
  1. horse hindquarters
  2. flattery
  3. boot-licking
马屁拍在马脚上。

He chose to kiss up to someone, but stepped on a landmine instead.

Source: Tatoeba