win joiner

a term used in online games describing a player joins or switches to the side that is winning
this is frowned upon in many gaming communities, especially when it gives the winning side a 2+ player advantage

kick the noob win joiner!

win joiner by uncle sam December 29, 2008

winjoiner 

In eg. Quake 3 Arena a person who joins the other team even though their score is much higher and are likely to win is called a winjoiner. A winjoiner is not very well seen by other players.

WTF?! Egghead winjoiner! Kick him!

winjoiner by Micke September 14, 2006