When one changes teams when the team he is on is losing and because they are a sore loser, he switches sides and joins the winning team. Usually the result is anger towards the person who switched and team killing is a nearly 100% possibility.
Red Team Player 1: I'm switching teams you guys are mm losing I'm fed up!
Blue Team Player 2: Aw damn we have been Chew Coughed.
Blue Team Player 5: We will have to T.K. him within seconds.