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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
smell. 1. to perceive the odor or scent of through the nose by means of the olfactory nerves; inhale the odor of. 2. to test by the sense of smell: He smelled the meat to see if it was fresh. 3. to perceive, detect, or discover by shrewdness or sagacity: The detective smelled foul play.