Definition of ptui in English:

ptui

(also ptooey)

Pronunciation /p(ə)ˈtuːi/ /ˈtuːi/

exclamation

North American
  • Representing the sound of a person spitting; (hence) expressing disgust or contempt: ‘Pah!’ ‘Pshaw!’.

Origin

1930s. Imitative. Compare pfui, phooey, and also ptish, pshaw, etc.