Definition of bish bosh in English:

bish bosh

exclamation

British
informal
  • Indicating something accomplished or completed quickly, simply, or expediently.

Origin

1980s; earliest use found in The Sun. Probably imitative of rapid blows or gestures, perhaps as an alteration of bish-bash-bosh.

Pronunciation

bish bosh

/ˌbɪʃ ˈbɒʃ/