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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Pus is generally white or a yellow-white color, but it can be greenish, blood-tinged, blue (in rare cases) or even a brown color. It can also have a foul odor. Pus can be present in a surgical incision that is becoming infected and is a sign that further treatment is needed.