Definitions by Manny Diaz

old girl 

Can be a number of things. Mostly it's the new flavor of the week, they are called this til they graduate to "Baby Momma" or "The Wife." Often times, old girl is a called this because she is kept on the DL and/or your ashamed of her.

"I think old girl put something in my drink"

Reggie: Whatchu doin tonight?
Ab: Chillin out with old girl.

old girl by Manny Diaz May 1, 2005