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1.
To define something in its simplest terms after something is explained in a complex form, making the simple person look like a dumbass since everyone understood it the first time.

Origin - Gilligan from Gilligan's Island. He always did this when the Professor explained why something did or did not work
Classic Gilliganism:

Professor: "In order to make this new coconut-based radio function properly, we need an new receiving antenna installed on top of that coconut tree by the lagoon. In order to properly support it, someone will have to be ambidextrous."

Gilligan: "Yeah, and they have to use both hands,too."
by Dr. Freeze July 04, 2009