Shinola is a contextual ad placement solution that automatically matches highly relevant advertisements (product descriptions) to web content generated from Trainable Semantic Vectors (TSVs). Trainable Semantic Vectors are a major breakthrough in representing and analyzing textual information.
Until now, reliable semantic analysis always came at the expense of scalability. Shinola is the first and only product placement technology that is accurate enough to capture semantic meaning, fast enough to power real-time applications, automated enough to maintain in dynamic environments, and scalable enough to handle web-sized problems.
Its immortality in colloquial English comes from its use in such alliterative phrases as [He] doesn't know shit from Shinola. Implied is that shit and Shinola, while superficially similar, are quite different in effect when applied to shoes or carelessly stepped in. One who fails to distinguish one from the other is therefore notably unwise or of substandard mental ability. The phrase is famously uttered, and demonstrated, in the 1979 Carl Reiner film, The Jerk, starring Steve Martin.
Similar meaning can be found in the expression, He doesn't know his ass from his elbow, or the variant, He doesn't know his ass from a hole in the wall/ground.