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3.
Indicating a losing or lost cause, with origins in the cooking practice of sticking a fork in meat to determine when done. Also "put a fork in me," "stick a fork in you."
“Let me explain, you're 25 now and will likely stay pretty hot for the next 5 years, but less so each year. Then the fade begins in earnest. By 35 stick a fork in it!”
by sensitivitytothings May 04, 2008
 
1.
1) A state of completion.

2) To be completely destroyed or defeated.
Stick a fork in it, it's done.

Stick a fork in him, he's done.
by eugene February 07, 2004
 
2.
1. To be done, finshed or over.
v. "Stick a fork in me"

In reference to a piece of meat or sausage, whereby one sticks a fork in it to test if it is properly cooked.
"I'm done. Stick a fork in me. It's been grand!" - Christian Slater, Pump Up The Volume, 1990
by Archon March 21, 2004
 
4.
To be done, done with it.
stick a fork in it it's done
by DizzyLizzy February 14, 2007
 
5.
Exhausted, used up, finished. From meat that is fully cooked and ready to be handled with a fork.
That board is toast-stick a fork in it
by numerator May 02, 2005
 
6.
Meaning that something is definitively finished such that whatever it is doing (or being done to it) should or can be stopped, or considered to be done.

From grilling -- not to test whether something is done, b/c that wouldn't make any sense, given what the phrase means. Instead, to stick a fork in the piece of sufficiently-grilled-meat so as to take it off the grill. Connotations of definitive doneness enhanced by sub-conscious notion that the piece of meat is not only completely cooked, it is no longer reasonably conceived of as part of a living animal, and thus can be stabbed with impunity.
Now that Iraq has descended into chaos, you can stick a fork into Bush's re-election chances.
by romberjo July 31, 2004
 
7.
To stick a fork in something means to cease whatever is happening or being said.
Just stick a fork in it, Mike. Or, stick a fork in him, he's done for tonight.
by § July 19, 2004