The mental storage space of imagery recalled upon for the purposes of female masturbation. The female equivalent of the male "spank bank".
Girl 1: Oh my GOD, did you SEE Daniel Craig in that speedo in Casino Royale??
Girl 2: Umm..yes! Filing that one in the tickle trunk for later.
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The act of male masturbation.
snuffleupagus left me on read... I had to tickle my trunk in the shower....