a term used by message forum fags that have no lives. Usually said by a person that can't articulate an intelligent response in an arguement.
Intelligent Person: I think the new Kanye West CD will be good.
Message Forum Fag: You Lost.
1. When a person says something so incredibly stupid or pointless that everyone present is speechless for up to thirty seconds.
2. When a person has nothing to say or says something stupid after a long string of insults with another person.
Joe: "Yo, Brandon! What's the English homework?
Brandon: "Did you know that Newton said that for every action there is an equal and opposite reaction..."
Joe: "You lost."
Foster: "Yeah, well you're so ugly, when your mom saw you for the first time she said, 'Damn! I knew I should have just given head!'"
Gaylord: "W...Well...Just...Just...Just...F YOU"
Foster: "You lost."