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1.
Same thing as Spank Bank, but with the updated wording of Fap

Collection of mental fantasies, images of men/women to use to help you ejaculate.
Jose: Madonna's nipple isn't worth fapping to dude.

Mike: You can always make a deposit into the Fap Bank for later, in case you're running low.

Jose: True that.
by 7heMike0074 June 13, 2012
 
2.
A rather delicate area of the brain, containing images, memories, and dreams, that can be used later to Fap in times of need.
How did you survive that weekend of camping? I tapped into the ol' fap bank.
by Benstar March 06, 2012