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1.
An elderly couple that frustrates tailing automobiles by driving extremely carefully or slow, typically in an unpassable situation. Also can be used in the singular, regarding only "Ma" or "Pa" or similar old fart, depending on the gender of said driver.
I was making good time on that off-road until I ran into Ma and Pa Kettle going frickin' 25 mph.
de The Fish 7 août 2006