A derogative phrase use mainly to humiliate someone after having "pwned" them at any particular task.
Often joined with the phrase "Shut the Fuck Up" or abreviated to be "STFD, STFU"
*after finally killing the camping jerkoff on your favorite shooter video game* "Sit the fuck down, asshole."
Originally coined by God when he choke-slammed Satan to what is now known as Hell.
To tell someone to "sit the fuck down" is to rub-in a victory of any proportion.
*Chuck just won a game of poker against some poker champion*
Chuck: SIT THE FUCK DOWN.
When downing a boss or another PvP player in certain games e.g. World of Warcraft this term is best used.
Daocan Killed Artoro "sit the fuck down"