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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 people describe that they noticed a carbon monoxide smell .. Although there could have been carbon monoxide in the air they were breathing and smelling, carbon monoxide does not smell in and of itself. Carbon monoxide is odorless, colorless, tasteless, non-irritating and toxic.Carbon monoxide is formed by the incomplete combustion (burning) of materials containing carbon and can be produced by virtually anything that burns.ombustion also produces heat, smoke, and number of other elements. In addition to carbon monoxide, nitrogen oxides, sulfur dioxide, particulates, and other toxins are also produced during combustion.