What does mean "The Oldest Joke in the book"?

answers1:It's just a figure of speech.To say that the joke's
old.Lol.Same with Oldest Trick In The Book.
answers2:It is just a common saying.If someone cheats you out of
something, people will say this meaning that this happen to others all
the time and you should have know better than to fall for it.an
example:A store advertisment have televisions for 50.00 each and you
go to purchase one and find out that you can get the television for
50.00 but you will have to purchase one for 200.00 to get the one for
50.00. It likes meaning that you have been tricked and you should have
known better....Show more
answers3:Oldest joke of the book defines a joke told over and over
again and so heard more than once. Book of Gags. : )
answers4:You are an oldest joke in the book, Charles...What joke? Joke???
answers5:The oldest joke, bit of trivia mentioned on the radio, some
guy farted and everyone laughed
answers6:been there done that... "you can't get fooled again"...the
codex of ultimate wisdom... its got a record of every thing that ever
was and or will be... or so the legend goes...