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1.
The opposite of for the win. Used to describe a situation or thing that is undesirable, whether that situation was caused by the speaker or by someone else. Often shouted when someone is killed in a multiplayer game. Most commonly used by gamers, though it's gaining popularity in general online culture for anything that's disliked.
"He just shot me with a rocket launcher! For the lose!"

"We have a math test tomorrow. For the lose."
by Iridosmine November 20, 2006