Cab Calloway and his orchestra play the title song, while pleasingly underdressed Rusty Standford shimmies in a way that suggests there's no rust in her joints in this soundie.
Soundies were short films, about three minutes in length. The were meant to be played on a machine called a Mills Panoram, a video jukebox that was typically to be found in bars, lounges, and similar venues. You put a dime in and got a performance from the ten on the machine. The movies would be changed weekly, and from 1940 through 1946, Mills and other companies produced more than two thousand soundies.
Cab looks like he's enjoying this one, but then he always did.