Definition of bish-bosh in English:

bish-bosh

noun

rare, informal
  • Nonsense, rubbish, foolish talk. Also as interjection Compare bosh.

Origin

1920s; earliest use found in The New York Times. Probably a reduplication (with vowel variation) of bosh.

Pronunciation

bish-bosh

/ˈbɪʃˌbɒʃ/