[Herodotus38]

That was actually much more interesting and detailed than I was expecting. I didn't know about all the pre-WWII foo usage in comics, popular slang, and cartoons. I also found the bit about the existence of "foo clubs" odd. It's like a meme where we only have scraps of the 7th iteration.

[user51442]

"foo" occurs in the lyrics to Cab Calloway's 1939 Jumpin' Jive, as in this clip, also featuring fabulous tap dancing from the Nicholas Brothers: https://www.youtube.com/watch?v=_8yGGtVKrD8