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1.
Refers to a ruse or trick that has been discovered. The game is over, the time of reckoning is here.
OMG -The jig is up - My girlfriend, Sally, has found out about my tryst with Jody last week and she's on her way over here now!!!!
by G L Runyan August 13, 2008
 
2.
When said by the current prime minister of england, the game will end for all time;
having to do with the ending of the game
the jig is up, omg u just lost the game!!!
by prof.alcatraz October 29, 2010