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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Checking for Pus and Fluid. 1  1. Observe the wound for yellowish or greenish pus or fluid. This discharge may also have a foul odour. 2  2. Look for a build-up of pus around the wound. If you notice pus forming beneath the skin, around the wound site, you may have an infection.