Caboodle is derived from the phrase "Kit and Caboodle". Kit and
caboodle is a phrase that evolved over time. Most recently from
the earlier phrase "kit and boodle". Boodle (or Buddle) is an
old word, and probably evolved from the Dutch "boedel" meaning a
crowd or bunch. "The whole boodle" was heard as long ago as the
early 19th century. Kit is also a time honored word with many
meanings, one of which is a collection of tools or possessions
that a person might carry with them. "The whole kit" was used by
1785. Caboodle is essentially a nonsense word, and is perhaps a
contraction or rhyme of "kit and boodle". Stephen Crane's "The
Red Badge of Courage" contains it: "Of course it might happen
that the hull (whole) kit and boodle might start and run, if any
big fighting came first-off.