Definition of big whoop in English:

big whoop

(also big whup, big woop)

exclamation

North American
informal
  • Expressing dismissiveness: ‘So what?’ ‘Who cares?’.

noun

North American
informal
  • Something of importance or significance; a big deal. Usually in negative contexts, as "no big whoop".

Origin

1980s. From big + whoop. Compare earlier big deal.

Pronunciation

big whoop

/ˌbɪɡ ˈwʊp/