It's known colloquially as "ear wax," or simply "wax." It obviously gets its name because of its appearance, and the process of ingesting it is called "dabbing" or taking a hit of a "dab." As High Times notes, it's also called BHO, which stands for "butane hash oil" or "butane honey oil." The process of of producing BHO is called "blasting," while producers are known as "blasters."