What is Clackers?
1.
Testicles (or rather "balls", typically in the sense of having "big balls", i.e. nerve or audacity)
"Can you believe the gigantic, cast-iron clackers on that guy?"
2.
Describing something that is extremely good/cool or in fashion.
Maa'aate! That chick Rufus hooked last nite was the Clackers!!
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3.
Spectacularly droopy breasts, that can be imagined beating together in similar fashion to the childs toy of the same name when the possesor of said clackers moves in a vertical direction. Also see clackerknobs. Has been transmuted into a slang term for breasts of all descriptions.
Would you look at the clackers on that?!?!?!
Refernces in the UK red top press to Judy Finnegan exposing her clackers on live TV when her top collapsed at an awards ceremony.
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4.
Persons possessing unique laughing sounds. Usually hired by comedians who would fill the house with as many as he could afford in order to impress management and get themselves 'held over.'
"This guy's gonna need a squadron of Uncle Bob's professional clackers to warm this room up."