HAH! Got the nickname about...hmmm.....40 years ago by dear hubby after walking behind me one day. He said my butt wiggled like a duck. I attribute it to sitting at a desk for around 50 years. Now I’m retired and I’m still sitting behind a desk, breathless to see what Q is going to post next :-)
His wife's nursing schoolmates used to call their friends into her room to watch her jump up and down--her butt cheeks would clap loudly like hands clapping.
I guess they could be a real pair with their clapping & duck-wiggling butts. LOL.