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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Natural gas doesnât actually smell like anything. Thatâs why we add a chemical called methyl mercaptan (methanethiol) to natural gas so youâll be able to smell it in case of a leak. Mercaptan has a very distinct and unpleasant odor that many people compare to the smell of rotten eggs.