彩虹屁

cǎihóngpì
(neologism c. 2017) (slang) over-the-top praise

CEDICT

neologism slang

Entry Composition

1 彩虹 cǎihóng rainbow

classifier: 道
2 屁 pì
  1. fart
  2. flatulence
  3. nonsense
  4. (usu. in the negative) what
  5. (not) a damn thing