What does it mean the Gig is up?

"The gig is up" is an idiomatic expression that signifies that a deceptive or unsustainable situation has been exposed or is coming to an end. It often implies that someone can no longer continue a charade or maintain a facade, and that the truth has been revealed. This phrase can apply to various contexts, from personal relationships to business dealings, indicating a turning point where consequences or accountability are imminent.