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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.
As they feed, anaerobic bacteria produce metabolites that have characteristically noxious smells. One set of smells is related to sulfur compounds. This is the source of that characteristically ârotten eggâ smell associated with bad breath secondary to post-nasal drip. Another set of smells is associated with polyamines that produce the classic putrescent odor of decay.