What is Dru Hill?

Fly-looking girls at a club or spot.

Taken from Ghostface Killah's, "One":

"Dru Hill bitches, specialist loungin at the mosk,
Suede cufy, Rabbi come dig up a dentist {"one"},
Rhymes is made of garlic, never in the target,
when the NARC's hit, rumor is you might start to spit {"one"},
You nice Lord, sweet daddy Grace, wind lifted,
on the dancefloor, mangos is free followed by Ghost {"one"}..."