Green’s Dictionary of Slang

excl. used to indcate the presence of an unpleasant, pungent odour.

1972		A. Theroux Three Wogs 43: ‘You take a whiff of their gardens sometime. Pee, Yoo: Pew—and I don’t mean maybe’.
1975		J. Roe Same Old Grind 55: She stood up and rummaged in Millie’s blue jeans hanging from a hook. ‘Pee-yoo! You got a dead mackerel up your hole?".