pish posh
US /ˌpɪʃ ˈpɑʃ/
UK /ˌpɪʃ ˈpɑʃ/

1.
used to express contemptuous dismissal of talk or ideas
:
•
“I think it’s a great idea!” “Pish posh, it’ll never work.”
•
He dismissed her concerns with a wave of his hand and a curt “pish posh.”
:
used to express contemptuous dismissal of talk or ideas