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1.
The religion of centered around the well respected "Notch" or Markus Persson, Dedicating him as the savior and murderer of bordem.
Steve: "PRAISE THE MIGHTY NOTCH!"
Other example:
Steve: "Notch dammit!". Commonly used after an explosion of a creeper, Usually only practiced in Notchism.
by The_Risen September 19, 2011
 
2.
A way of life that is lived
I live Notchism
by Dr Notch March 31, 2010