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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.
Your nose knowsâthe smell of mercaptan is unmistakable. And thatâs exactly why it is added to natural gas, helping you detect even the smallest amount of natural gas leaking into the air. In its native state, natural gas is odorless, colorless and tasteless. Mercaptan, the harmless chemical that is added to natural gas, contains sulfur, which makes it smell. Many people describe the odor of mercaptan as similar to rotten eggs. When mercaptan is added to natural gas, it rises and dissipates much like the gas itself, making the two substances ideal companions.