When you see some real good shit irl and cant take a picture for later so you memorise it for later and put it in the wank bank
John: Ay you see that big bunda over there
Mike: Yeah can you take a pic for later
John: Nah sorry dude
Mike: Its fine ill just store the image in the wank bank
A wank bank is when multiple men masturbate into a woman's vagina one after another
Hey my girlfriend said I could invite some friends over for a wank bank
The act of masturbating vigorously over a strippers ass.
Bruh Daequan been wanking and banking in the back room. Fucking legend.