Like how a snowball rolls down a hill and gets bigger and bigger exponentially fast! it is to refer to how fast a person can gain momentum with a early lead and dominate the whole rest of the game

Alright one person said it people. Don't need the entirety of GD.

Good guy forum goers helping out a little junior. It's a good day.

Google exists for a reason!

Old tutorial video about Zoning

http://www.youtube.com/watch?v=0kxGQ3gWdrM

And snowballing is basically when a champ can take a small lead and turn it into a big lead. For example, lets say your lane opponent gets a kill on you. After that they always seem to be a level or two ahead of you and they are further ahead with their items. Because of this, they are able to bully you around in lane and get more kills more easily, either on you or your teammates.