St Vitus dance is now called Sydenham's Chorea, and is characterised by jerky uncontrolled movements. A childrens disease. Lots of references by Google.
Yes, my parents used that.

'You look like you found a tanner and lost a bob!"
"You look like a week of wet week-ends."
'Go and tell somebody who's interested."
"You'll do." Never said WHAT I'd do.