A person who you meet in a matchmaking game or someone you otherwise don't know. They are bad at games and possibly at life. You usually want to play multiplayer games with a full party of friends. This way you can avoid having to play with randies.
Derived from the Anglo-Saxon word, Randy Travis.
The Decode, Torture Trilogy, TrickyPlatypus.
WOW! Look at that bad kid randy! He's so "good" at games!