Bobby, doan you listen to Huey. He resides in EAST Texas. The queaston "Heah?" is just as good as the statement/ exclamation "Ya Heah!" as a proper form of address meaning "do you unnerstand?"
It's just that the Cajun/ Arkansas influence has not been completely eliminated from the EAST Texas dialect yet. They can't conjugate worth a flip. Not even with first cousins.
BT