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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Actual pus is drainage that is full of dead white blood cells that rush to the site to help the body fight the infection. It also contains dead tissue and bacteria or fungi. Pus is typically white/yellow color, but can be brown or even green. Some types of pus have a foul odor. That said, not all pus is cause for alarm. A pimple, for example, is a normal part of life and is not cause for a trip to the emergency room, but is an example of pus forming at the site of an infection.