Generally an abusive, scheming, manipulative exploitative person with very poor judgement of value in life.
The expression is not limited to either gender, and the recipient can be alive or dead.
E.g." Thatcher..she was a total cunt! ", or , Cameron; not only is he a nobhead and wanker, but also a 'total cunt'.
To be used with caution so as not to dilute its meaning!
A total conversion when used with respect to video games, is a type of mod that alters the game to such a degree that it either no longer, or very loosely resembles the original game.
Because "Counter Strike" was created as a total conversion of "Half Life", the gameplay is completely different.