Oodles and caboodles
"Oodles" means "a whole lot," as in "oodles of money." Its origin, unfortunately, is not known, say editors at Merriam Webster, Inc.
One theory is that "oodles" evloved from "huddle," which in its earliest sense meant "a close-packed group; bunch." When the sounds of the two words and their meanings are looked at more closely, however, a possible connection looks very unlikely.
Some have asserted that "oodles" is an invention from Irish of Australian English. The earliest evidence from the word is American, though, so those theories won't hold water.
"Oodles" was first spotted in this 1869 passage from an American source: "A Texan never has a great quantity of any thing, but he has `scads' of it, or `oodles', or `dead oodles'... "As you can see in this quotation, "oodles" also occurred as "dead oodles" early in its history. This is apparently the same "dead loads," a phrase used by Mark Twain and others to mean "a large number." But whether "oodles" is related to "loads" we can't say.
Other possible, but again unprovable, sources are "boodle," which means "a collection or lot of persons" or simply "a collection or lot," and "caboodle," which also means "a collection or lot." Both of these words are found in print earlier than "oodles."