n. a typical or average male American citizen. What do you think Joe Blow really thinks about all this? Joe Doakes thinks the government ought to pay for all medical care.
An ordinary person. That phrase meant just an average guy—any old Joe (“Joe Doakes” was a variation). It was the predecessor of “Joe Sixpack.” In fact, “Joe” was such a common first name (or nickname) that it became a slang word for coffee, which was also found everywhere.