It refers to any older female in a position if familial responsibility.
Tyler: “Yo man, wanna go hang at the skate park?”
Jayden: “Sure dude, gotta call the T Jones though – she’ll bust my chops if I don’t tell her.”
Tyler: “Pussy boy.”
Jayden: “Don’t need added grief man – me ma’s a good ‘un really.”
Here's a clipping from dmagazine, which talks about the Dallas term of T Jones: