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Used on the internet or on Club Penguin so you can cuss without getting caught.
Random dude: Fak u bitch

Wrong way: Club Penguin troll: Oh fuck I just lost the snow sled game. *BANNED*

Right Way: Club Penguin troll who found a loop hole: Oh fak yeah I just won the snow sled race!
by Ninja4hire September 18, 2012
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2
A word often used as a substitute for "fuck". Generally used as an insult.

Terms such as "fakhead" are also sometimes used, although it is believed that the original word was fakin (fak-ing) derived from a mispelling of "baking".
"OMG you absolute fak!" or
"Matt, you're such a fakhead!"
by Churkirby November 01, 2007
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