Definition of "phat"

Aiyyo, Nas? Fuck that, man, that shit was phat / But kick that for them gangstas, man, fuck all that!

1994, “One Time 4 Your Mind”, in Illmatic, performed by Nas

We saw the kind of life bailers and hustlers were living. The women, the flamboyant cars, the phat mansions, the mad platinum jewelry.

2006, Noire [pseudonym], Thug-A-Licious: An Urban Erotic Tale, New York, N.Y.: One World/Ballantine Books, page 52