Creating a new object by giving a handle to its definition

In this Udacity video on game development, the instructor mentions that Javascript allows us to create an object by giving a handle to its definition. Then, it says that to allow this "an overloaded object definition will update a hash table with a pointer to its class definition".

I quite know what a hash table, a pointer, an overloaded method, and the factory pattern are, but I cannot make sense of this mysterious statement, or of the rest of the explanation.