Chloe does it and its hilarious
She is quite an ,erm, well built lady
(she had two sets of kittens before living with us and has the matronly "sag") and is also now 17.
When she does the "bum wiggle" everything else starts to shake in sympathy. Its like a little feline Tsunami .....
If we laugh, she stops, looks round all embarrassed and has a wash
If we ignore her, she leaps forward after her prey - usually a fluffy toy mouse - and "kills" it with great gusto