Military slang for saline solution administered rectally. This is usually done when medics are unable to find a suitable vein. So named because the Army Rangers are notorious for enjoying rimjobs and other ass play.
That fat turd was drunk and puked all over the medics, so they gave him a Ranger IV and took photos.
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In common usage, it means "clueless of being ignorant" but it's used to add an air of fake scientific authority to a cheap shot. It generally outs the author as an incompetent writer, ironically exhibiting the Dunning-Kruger effect themselves.
"G is the classic example of the Dunning-Kruger effect."
G: "No, the classic example is still your Mom's abortionist."
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