To count on something.

someone who is sexy beyond mean

cashing in a large quantity of money.

To tell someone they lying or overdoing smth

The act of depositing drugs into your anus to get high quicker.

In the popular TV show "The Weakest Link" contestants have an opportunity to "bank" if they want to safehouse themselves from a future mistake. This inspires the term "banking" to describe women of a certain age (generally 33+) settling, or "banking" on a perhaps unsuitable partner in order to leave appropriate time for marriage and babies.