Another pointless wigga phrase that doesn't even actually save you any time. Saying 'that's true' would take roughly 0.006 seconds longer and make you sound like far less of a wannabe gangster and allround loser. Statistics have shown that the 93.1% of the parents of people who use this phrase work as Investment Bankers, and are most definately not of Afro-Caribbean descent.
Whiteboy who thinks he's black: Yo homie, I be a mad fool fo tryin to sound ghetto when my parents be livin up in tha suburbs
His Whiteboy mate: true dat. What the fuck are we doing, who are we trying to impress.