Used to describe something/someone that/who is particuliarly legitimate.
*can be abbrviated TDDT*
Parnell: Well, let's hit up Yahoo Maps to find the dopest route.
Samberg: I prefer MapQuest.
Parnell: That's a good one, too.
Samberg: Google Maps is the best.
Parnell: Tru dat!
Both: Double tru!
Mary: I'm quite contrary.
Bobbert: Tru dat, double tru.
Watermelondrea - I love you.
Taeshon - *silence*
Watermelondrea - This is awkward.
Taeshon - TDDT