Typically a southern (US) term. When in high school, and a group of male and female friends decide to go skinny dipping at the lake, invariably the most endowed male member of the group will walk up and down the bank, whilst his donkey schlong sways to and fro, searching for the optimal spot to enter the water, thereby flaunting his manhood to both male and female members of the group.

Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.

A person who has a very large penis.

When a group of friends go down to the swimming hole, the bankwalker is a person with a large penis who, after getting naked does not get in the water but prefers to "walk the bank" to show off his stuff