How can I figure out if my butt jiggles too much?

I've seen similar questions kind of like this one but I still feel really insecure about it. Every now and then I see my reflection as a walk past a window or something reflective and see my butt jiggle. I just can't tell if it's good or bad. I'm absolutely fine with the shape of it but still- what exactly draws the line between toned and unattractive?
How can I figure out if my butt jiggles too much?
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