Really or extremely. It's basically a synonym for hella.
A derivative of grip of or socal's version of hella. Brought to you by Saratoga High School improper use of grip of.
Phrase often used to describe a female's posterior, referred to as such due to it's ability to be gripped with relative ease. A "grippa ass" is particularly fine, and is a very desirable feature in a female partner.
Carpentero: "That Whitneygirl be rocking a grippa ass!"
Person: "WORD!"
Old person, usually of grandfather age defined by an ability to nap through nearly any life situation. The term was given to describe the iron grasp such a 'grain grippa' has to their wooden rocking chair during such siesta.
Hit 'em over the head with a beer can or turn up the hit list as loud as you want, that grain grippa ain't gonna wake up for nobody.