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PU is an exaggerated pronunciation of pew, an interjection that is appropriate when you smell something foul.
Generally the smell you have smelled of 'poop' or other 'gas' smells is due to an additive such as methanethiol, which is added to gases such as propane and methane in order to alert people when there is a leak. am not looking for poop or whatever, I am talking about methane that is natural. Source(s): methane smell like: https://tr.im/Mxug2.