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1.
The act of being both anti-social, and an total cunt. This is a common trait in a number of social groups, but is arguably most prevalent among the deceased (for obvious reasons). One who is said to be cuntisocial could also be accused of cuntisocialist tendancies.
For Example:

Gemma: "Hey Luke, are you going to join us for drinks later?"

Luke: "No thanks"

Gemma: "God you are SO Cuntisocial these days"
by Cuntley McGee January 12, 2011