A mudder -- also known as a muddie or mudhead -- is a person who spends a great deal of time playing the online games known as MUDs. Only a few years ago, mudders were a common sight in college computer labs, alongside IRCies and, occasionally, gweeps. Today, though, most recreational Internet users wouldn't know a MUD from a spud; while many MUDs survive, more "user-friendly" online games have largely eclipsed them in popularity.