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Like tromboning, but for girls. Said so because in order to give a girl hand fun from behind you have to move your hands like you're playing a castanet.
guy 1: has your girl tromboned you yet?
guy 2: naw, but i totally castanetted her last night.
by triggerwords February 09, 2012
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The female gentialia. Frequently found in conjunction with "tuna".
She had a great pair of tuna castanets.

Samantha was a keen player of the tuna castanets.
by Indie Punk July 27, 2003
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