A word used by professional wrestlers to describe underage groupie girls that hang outside the door that leads to the dressing room or locker room. When a pro wrestler comes out from the dressing room, they scream at a very high pitch. Ring rats will try to get the attention of a pro wrestler, seeing if they can get a date.
There is a whole bunch of ring rats hanging outside the locker room tonight.
A female (not necessarily underage) who attends professional wrestling shows, and attempts to sleep with crew members to get to the wrestlers, or sometimes the wrestlers themselves. A groupie, in plainer terms.