Goom bye

Anybody know its origin? For some reason I think it may be connected with WWII/40's somehow.

Thanks again!

"Ritualistic slang expressions used on greeting and departing continued to do well in the 1940s..." "Goom bye" was one of the expressions during the 1940s, the Jive Generation. From "Flappers 2 Rappers: American Youth Slang" by Tom Dalzell (Merriam-Webster Inc., Springfield, Md., 1996).

Some others were "What's buzzin' cousin?" "Be seeing you in the funnies." "Bye-bye, buy bonds." "Plant you now, dig you later."

And so forth.