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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.
Sometimes though it has an extremely foul smell but the odor of the burp in these instances could be a symptom of certain digestive disorders and diseases. Sulfur (also spelled as sulphur) is often associated with a foul odor when it is mixed with other substances like hydrogen. With regards to sulfur burps, most of us understand it to mean rotten eggs. Hydrogen sulfide is the gas that is released from rotten eggs to give it the characteristic offensive odor, similar to stink bombs used in pranks and one of the components of flatus (âfartâ). While this offensive odor is not entirely unexpected with flatus, it is often a cause for concern when it is smelled in burps.