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A statement attesting to the veracity of an assertion. Origination stems from the phrase, double true, made famous by Andy Samberg and Chris Parnell in their SNL skit, Lazy Sunday.
Guy 1: You could see Lindsay Lohan's smash up coming from a mile a way.

Guy 2: True dat!

Guy 1: True times two!
by Davenator June 01, 2007
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