Team Jumper

Going from liking one team to liking another.

Your such a team jumper. How can you go from likng Team1 to Team3

Team-jumper

Came up with it while playing Battlefield 1942. This is a person who changes to the team with the most/all of the captured flags points rather than helping his own team take them back.

That no-talent team-jumper just went to the other side instead of helping us out!