Sore winners are anyone who brags far too much for their feeble accomplishments.
*Erik and Steve are playing Ping Pong*
(For the record Erik beat Steve at Ping Pong more than 50 times)
Steve: "10-20 Match point." *servers*
*Lands off the table*
Erik: "Ohhhhhhh! You were so wrong! You'll never beat me, you said you would today!!! Ohhh!!!! What now biyatch!?!? OHHHHH!!! Volley for serve let's play again."
Steve: "No dude! You beat me everytime and you are a sore winner."