劈啪

pīpā
(onom.) for crack, slap, clap, clatter etc

CEDICT

onomatopoeic

Entry Composition

1 劈 pī
  1. to hack
  2. to chop
  3. to split open
  4. (of lightning) to strike
2 啪 pā
  1. (onom.) bang
  2. pop
  3. pow