What does 'foo' and 'bar' mean? Does anyone know the history.

Since college days, we have been seeing the words 'foo' and 'bar' in a hell lot of programs...So what do these variable names mean ?...

The following links provide some really amusing information:
http://www.catb.org/~esr/jargon/html/F/foo.html

http://kb.indiana.edu/data/aetq.html?cust=379462.50587.30

http://www.catb.org/~esr/jargon/html/F/foobar.html