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Usually meaning the end of something, or a final part in something; that's the end.
Taken from the movie, Goodfellas during the scene where Tommy DeVito is supposed to be made a member of the Mafia.

*group enters an empty room*

Tommy DeVito: Aww no!

*Mob hitman shoots Tommy in the back of the head*

Mob hitman #1: And that's that.

Mob hitman #2: No fucking joke.

Mob hitman #1: Let's go, I'm fucking hungry.
by HatefulPilot September 02, 2011
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Jan 25 Word of the Day
Oh youā€™re just being alive? Iā€™m horny too
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1. A discussion that is no longer up for debate. 2. A decision is made and there is no room for change or questioning.
The sky is blue and thats that.
by MJ and Akay February 23, 2010
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