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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.
Pus is a thick, whitish to yellowish material composed primarily of dead cells that generally forms as a by-product of bacterial infections. The inflammatory cells that participate in the bodyâs immune response at the site of an infection eventually degrade and die, creating the substance known as pus.One of the most common types of bacteria that cause pus formation is Staphylococcus aureus, although any bacterial infection may produce pus.hen pus forms within enclosed spaces in the tissues, it causes abscesses. When it forms on the skin surface, it causes lumps known as pustules or pimples.