A widely unknown person, originating from the statement, "Aint you Nathaniel B?" means that the person who was told this statement looks, sounds, or acts like Nathaniel B. This isn't complimentary but is used as an insult. The insult is to show that the person telling them the statement is much smarter and more logical. Most people wouldn't understand this statement, which also shows how it can leave people dumbfounded. "Aint you Nathaniel B?" is also in the same xenoliteracy group as, "cuz".
"Hold on, you can't handle me, hold up, Aint you Nathaniel B?"