dude, can you blackwater for me so i can get to the next level?  john's going to blackwater a few rounds for me to improve my ranking
getting (or hiring) a friend to play for you in a videogame to improve your ranking and/or reach the next level
"dude, can you blackwater for me so i can get to the next level?  john's going to blackwater a few rounds for me to improve my ranking" What is the definition of "blackwater"?