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What Does âP.U.â (As in Something Smelly) Stand For? Mark C. asks: What does the letters in the stinky term P.U. stand for? Often used to accuse someone of exceeding his allotted level of funk, P.U. is, surprisingly, not an acronym, but, rather, likely was derived simply from the pronunciation of its parent word. Dating back to the early 17th century, a common exclamation of contempt for a foul odor was pyoo.
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.