I used his own Jarate against him, then headshotted him from across the map, then backstabbed him, then tied him to the payload before it exploded, then used every taunt-kill simultaneously on him, then Jarate'd him again, then backstabbed him again, then pulled all his chest hair out one by one, then shaved his mustache, then shaved his second mustache, then headshotted him again, and finally stole his hat and stuck him in an infinite loop with my portal gun.
How did you defeat an entire army of Eyelander&Targe Demomen while you were armed with a foam noodle?