Off the porch

Recently I received a letter from a cousin who used an expression I am unfamiliar with; it was something like "I too piss off the porch at sunset." I've never heard it before and wondered if it is indeed a colloquialism, or if my cousin just invented it. Could you help me?

I don't know what it means. Maybe that he is common folk. Referring to the time before indoor plumbing when it was more convenient to wee off the porch before going to bed rather than go to the outhouse?

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