Black humour: "Would it shift bacon rind" - What does that mean? (Context inside)?

[EvgenyZhurenkov]

Black humour: "Would it shift bacon rind" - What does that mean? (Context inside)?

Stephen
Ah. Yeah. Visitors to his Sanatarium in Battle Creek would follow a water enema with a yoghurt enema. A pint of yogurt, half of which would be taken orally, and half anally.

Jimmy
Well, you want to sort out which is which!

Stephen
Yeah, you would. Yeah. A good smoothie.

Johnny
Wouldn't it shift bacon rind?

Stephen
"Would it shift bacon rind"?

Johnny
It was a question. Never mind.

Stephen
Is it? Okay.

Johnny
It was nothing. It was--

Stephen
No, it was important.

Johnny
Let's wait 'til we holiday in Paris.
---
Please, explain this joke for me.

 

[Nighthawk]

What I get out of it is this. It means Johnny has a sick mind that no one else can, or should want to, understand.