Funny stuff, glad we're not the only ones doing that.  Ours is multi teired though; charlie=hottie, low level charlie=almost a hottie, major charlie=obvious innit?, post charlie=you know she used to be hot, chuck=average but good, then there's the different levels of chuck.  The heads up though is charlie or chuck, usually yelled loudly from one end of the dock to the other. 

Funny one was when there were a couple of hotties makin their way around the resort, we walk out from a boat cause somebody yells "hey charlie!" from the shop, and we hear one of the girls say "jeez, there sure must be a lot of guys here named charlie!!", we were laughin so hard off that one.