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The Tiny bladder that contains sperm. Alledged to only hold enough for around 7 wanks.

7 also being the mystical number of wanks before you hit the "wank barrier"
"I got up to seven wanks tonight but I just couldn't cum no more!...Think I emptied the wank bladder!"

Or:
"I tried to get past seven wanks but hit the wank barrier"
by combatstig March 15, 2009
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