Translates from internet slang to "I have Beaten you in a quarrel" or more directly as “I am the winner”

Often used in the “real world” for comedy effect.
steam player 1: where are yoo
steam player 1: theres just the two of us
steam player 1: muhaha
steam player 2: IZ SEE JOO FAGGOT
* steam player 1 recieved shot to the head by steam player 2
steam player 2: I AM TEH WIN1111111one
by Urban Dictionary July 16, 2006
Get the I am teh win mug.