What is the etymology of 'oojiboo'?

Solution 1:

OED:

Etymology: Apparently < oojah n. + an arbitrary element boo. Compare jigaboo n., icky-boo adj. at icky adj. and n. Derivatives, hickboo n., etc.

Examples from 1918, 1925, 1933.

Solution 2:

The term 'oojah' is soldiers' slang, and was known as a 'gadget' during WWII according to the Dictionary of service slang, compiled by Park Kendall (1944)

A theory on the origin of ooja-ka-piv:

"Widget" is a bit more recent than "gadget," means roughly the same thing, and may be simply an alteration of the word "gadget." One theory, in fact, holds that "widget" arose in the Royal Navy as a contraction of "wifflow-gadget," also known as a "hook-me-dingy" or "ooja-ka-piv." All those terms, like "gadget" itself, were invented by sailors who had momentarily forgotten what to call a particular piece of equipment.

& the term "Oojieoo" -notably a song title found in a 1910 Catalog of copyright entries

Oojieoo. The hardest worked word. Signified anything, its nearest equivalent being "gadget." Once I heard this dialogue :

—Lorry driver: "Sorry, Flight, but in the fog a fellow passed me on the wrong side and carried away my oojiboo."

Flight Sergeant: "That's the second side-lamp you've done in this week." -Origins and meanings of popular phrases & names, including those which came into use during the great war, by Basil Harg ave. [1932]