If you are referring to joke as shown in Flash TV series, E is kinetic Energy(as in Einstein's relativity equation, E=mc squared) which you can't touch. “U can't touch this” is a song by MC Hammer. read more
In other words he thought he could make money but his life style could not be covered by his music so he went bankrupt. MC Hammer can often be seen in the Central Valley of Cali"Thats northern cali" do to the fact he now lives in a small one bed room house in Tracy. MC Hammer can also been seen in Modesto Cali time to time. read more