Really used by the U.S. Pork company, but now it's become a term to define a white person who trys to act black, and the black people seem to notice and say "oh look, the other white meat". Now it's overused by white people who think they are funny.
An expression used usually between two or more people in order to describe any newly discovered object, definition, situation, etc. This is something that one party is not aware of or that they possess the wrong definition or knowledge of.