* Something unexpected or funny: Imagine a squirrel bouncing on a trampoline! It's a surprising and amusing image.
* A chaotic or unpredictable situation: The image of a squirrel on a trampoline could be used to represent a situation that's lively and a bit out of control.
* A silly or nonsensical idea: The phrase might be used as a placeholder for a ridiculous or absurd concept.
In short, it's an open-ended phrase that can be interpreted in various ways depending on the context.