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1.
To shave multiple lines (usually two or three) through one's eyebrows to try and look hard.
I was watchin Aaron Lennon and I saw he was notched, so I was like damn I need to do that.
by Devan Jaxon September 09, 2010
 
2.
Updates to a program that completely break the code. This normally causes the code to work but in such a poor manner that it is unusable. Typically in the form of bug fixing.

This comes from the user Notch, the creator of Minecraft, who updated his game and created numerous bugs that make the game completely unplayable.
I notched my game and now nobody can play it
by NotchLover101 May 29, 2011