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1.
Punch A Kitten: A internet term that is usually used when someone has either:

1. said something so stupid they must be punished to some extent and since we do not have the power to reach thru the internet yet to slap that person then a kitten must be punched on their behalf.

2. a individual has become enraged with such anger the only possible means of feeling better is to do the unthinkable of punching such a cute and cuddly animal that has done no wrong.
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Example1.

Forum user 1. I lub the internetz dat much i muszt beez da bombzerz!

Forum user 2. Your inablility to type something intelligent makes me want to punch a kitten You Grand Master Cock Dragon!
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Example 2.

Texas Republican: WTF Obama won the God Damn Election!!! That Dick Banger makes me so fuckin angry I want to go Punch a Kitten right now!!!
by Dusty M. August 28, 2009