An image seen that you retain in your head for future reference. Typically, something sexually stimulating that you might crack one off to at a later date, hence comparison with Wank Bank.
Did you see her? Long blonde hair, big tits, great legs, hot body, slutty boots... That's another film for the late night showing at the Skull Cinema.
Films that usually show or tell about how society is bad or corrupted in some way usually shown through the point of view of someone with a mental illness/disorder