The list of people of the opposite sex you keep in your head at any one moment that you could possibly bang.
Dude, Sandra's busy tonight, I guess I'll have to take a look at my depth chart.
A slut (male or female). A person who, on a hook up chart, is a central person adding numerous other people to the chart.
She's such a hub. She hooked up with 15 guys and added all their connections to the web.