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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Since natural gas is odorless and colorless in its natural form, a distinctive odorant called mercaptan is added to help you detect a gas leak. Mercaptan makes the gas smell like sulfur or ârotten eggsâ. INDOOR GAS LEAKS. If you smell a faint gas odor near an appliance: Check all pilot lights.