pooh

Concise Oxford English Dictionary © 2008 Oxford University Press:
pooh /puː/ (also poo) informal

▶exclamation

• 1 expressing disgust at an unpleasant smell.

• 2 expressing impatience or contempt.

▶noun excrement.

■ an act of defecating.

▶verb defecate.

– origin C16: natural exclam.