clackers

Definition

Slang

  • plural noun balls (in both the literal and figurative slang senses). The word, recorded in the early 1990s, was the name of a fashionable children’s toy of the 1970s consisting of two plastic balls on a string wound round the fingers and knocked together. Conkers is a synonym of similar provenance.
http://www.dictionarycentral.com/definition/clackers.html