Not having been around at the time I can only comment from what I have read about the development of popular music in the last century but I understand that the terms "Rock and Roll" and "Nutbush" had alternative meanings in the African-American southern music culture during the 1920s. There were 'certain' songs at the time that used these terms in the lyrics with emphasis on interpreting the words in another way. Some of these were recorded but not broadcast on radio at the time. It was the rhythms behind these songs that developed into the genre that became prominent in the 1950s which was known as Rock and Roll music.

My memory of Nutbush is the line-dance to the Tina Turner song. A couple of clips:

The basic steps
https://www.youtube.com/watch?v=TXzLT27IPME

En masse
https://www.youtube.com/watch?v=q0CA605NS1E

I can tell you that when performed with real energy with a few under the belt by real aficionados, it makes the place jump. Unfortunately I couldn't find such a clip.

Ike uses the striking sound of a Hohner Clavinet - perhaps imitating Stevie Wonder's 'Superstition' from a year earlier.
Tina's '90's-version of song has no Clavinet (or MiniMoog)
A half year after Ike's unique orchestration, Milan Williams also uses Clavinet+MiniMoog for Funk instrumental "Machine Gun".

Interesting mentioning the Clavinet. Part of my learning to play the Bass guitar is to learn some basic bass lines of pop songs and I selected "Howzat" (Sherbet) as one of my projects. While studying the "sound" of the song I was trying to replicate the Bass sound full of high order harmonics, sustain and a "voice". Sure enough in one of the live shows (NOT countdown!) and while the Bassist is hammering away pretty much timing the song there is the Melody guy thumping away on a Clavinet making lots of pretty sounds with his right hand and the left hand is playing the Bass line and providing the "voice" part and some fancy bits of the Bass line. The studio version you hear on albums sounds like it has the Clavinet track but later stage live performances just have straight Bass and boy those guys are light years ahead of me whatever they play!! The Clavinet looks like the predecessor to a full keyboard set up.
I'm finding out again why I wound up making amps and bins and not playing ...no musical talent!
We will see Sherbet live this year (my son will do the show, i'll be in bed!) and watch for a Clavinet!
Fred.

"Sherbet"

Once again the Clavinet propelled a song to the top of the charts, as it did for Dire Straits' "Money for Nothing" where one can hear bass Clavinet accents by their Hall of Fame keyboardist Allan Clark.

Things were never the same after Stevie Wonder's 1972 "Superstition" [which is played using the black keys (Eb-minor) of a Clavinet.]