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1.
A classy, mellow form of agreement (or sometimes just acknowledgement) originating in the white-collar Philly suburbs.
Paul: Yo the Flyers are winning the Cup this year for sure.
Ray: Truuu.

Bruce: Hey who's trying to order some food?
Ray: Truuu.

or...

Dan: I'm from Philly.
Ray: Not truuu.
by Ray_Wils April 07, 2014
 
2.
A way of saying true, exemplifying the u's towards the end.

A way of agreeing in a mellow way
James: Bro I got an A on the test!
John: Truuu
by Miriam-Webster Jr. September 25, 2013