It was invented in Chicago in 1928 and was named after "Butterfingers" which is what we called people in high school when they couldnt catch during sports. They were then sold to Nestle and were advertised by Bart Simpson. However this partnership ended when Simpsons made a joke about them. Not cool.
As a meal Edit
Buttefingers can be eaten as candy bars or you can eat mini Butterfingers as french fries with your hamburger.