Finnegan pin n. a non-existent part or tool; a thing whose name is forgotten or unknown; a doo-dad or thingamajig. (source: Double-Tongued Dictionary)
Further reading
Daniel in Nicholasville, Kentucky, says his grandfather would warn that if he got in trouble, he’d be in deep yogurt. That’s probably just a euphemism for deep doo-doo, deep foo-foo, or an even stronger epithet piled high. This is part...
Tommy in Lexington, Kentucky, recalls that when he was a youngster, a sightseeing trip to Washington, D.C., led to a hilarious misunderstanding about exactly what might be on offer at the National Mall. This is part of a complete episode. Transcript...