Used in reference to a girl or woman who has a good tit to ass ratio. Usually someone you would hook up with.
Damn, she's grade A.
by ABigJohnson November 14, 2009
a mid atlantic/ southern term for eating the box
As soon as I get back I'm callin him for some of that Grade A
by PsychoNutBalls April 16, 2010
The highest quality, refering to a girls ass.
"That is grade A quality meat"
by B-Stange April 14, 2003