Noun. A zoo of images one creates in his or her mind in order to be withdrawn at a later date to be used as assisistance while pounding one out. The bank is only temporary storage and is inferior in many ways to the cellular phone camera.
See mental picture.
Damn I hope the spank bank is open on sundays because I'm makin' a deposit!
A distant cousin of the Stranger, involving atleast one glove, having the appearance of a gorilla's mitt. The subject shall proceed in to pleasuring him or herself whilst pleading for mercy aloud and taking moment to immitate his assailant's grunts. One might also fantasize about standing too close to the gorilla cage and/or being caught outside in the wilderness by some beast. This act is often performed in a private zoo type setting or while watching Animal Planet.
"Last night I was watching a documentary on mating rituals of other primates for school, so to get in the mood I decided to hook myself up with an Anonymous Gorilla."