1 definition by triggerwords

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 9, 2012
Get the castanet mug.