impewnity
Imperviousness to getting in dutch for odiferous methane-expellings.
Churches tend to be liberally tolerant of their parishioners' physical shortcomings as long as they behave themselves socially, so you can generally expect "impewnity" while you're there --- i.e., you can fart all you want while sitting in the chapel's wooden benches, provided you are courteous and respectful in your overall treatment of others present.
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