If you've ever seen a hen-party group strutting their stuff, then you'll have seen deeley-boppers; headbands with fluffy 'antennae' bouncing around (here's a selection from a company specialising in hen party accessories - don't look if you're a prude). I've seen many before but learnt the word for the first time last night. And where didI learn it? Believe it or not, at the National Portrait Gallery. I was looking at the portraits which had been entered into this year's BP competition and one artist had painted her daughter wearing deeley-boppers, and the word was part of the title.
Deeley-boppers seems to be the British name for these items, probably by association with teeny-boppers (which many of these young hen-night women seem to be). In America they're called Deeley (or Deely)-bobbers, and this version is in the Oxford English Dictionary. Its definition is: "A proprietary name (in the US) for a variety of children's novelty headgear consisting of a pair of ornaments (eg balls) attached antenna-like by springs or wires to a head-band". They 'bob' around, hence their name, I suppose. I can't find any references to a toy-making company called Deely or Deeley, so presumably they don't exist any more.