Green’s Dictionary of Slang

1. (US black) the penis.

1928

Hokum Boys ‘Beedle-Um-Bum’ 🎵 Oh, my beedle-um-bum / Come and see if you ain’t none, / It ain’t small and it ain’t made wide ./ [...] / It’s the best beedle-um-bum that’s made in Tennessee.

2. (US black) the vagina.

1928

Tampa Red & Georgia Tom ‘It’s Tight Like That’ 🎵 Mandy Lee Jones, she does her vampin’ all night [...] / Oh it’s tight like that, beedle-um-bum.