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1. A gigantic penis used for anal sex, presumably so large that it tickles the recipient's spleen.

2. A person who uses his gigantic penis for anal sex.
1. Wow, that's some spleen tickler you've got there. Bobby.

2. "Hey, are you a pitcher or catcher?" "I'm not only a pitcher, but a spleen tickler too."
by GusTheD December 15, 2011