Firmativity 

(firm-a-tiv-ity)
: the level of firm; not weak; having a solid or compact structure
usually referenced to the firm level of a woman's ass or breasts.
One may judge the firmativity of an ass or breasts by firmly grabbing a palmful, then grasping and/or coressing the subjects goods, then judging by curves, proportion, and perkiness..will result in the determination of the Firmativity.

"So me and this girl were going at it and i reached down and grabbed her ass..i couldn't get over the firmativity of her ass..it was breathtaking."

Firmativity by Kosmilly May 2, 2009

Paranormal Frativity 

Strange happenings that manifest at night and cannot be remembered, usually due to cheap beer and shitty vodka.

Bro #1: Dude, why the fuck is there a bra in the hallway and the living room covered in flour?

Bro #2: I dunno man, I was blacked the fuck out. Must have been some paranormal frativity.

Paranormal Frativity by steezycheese September 20, 2010

Frativity 

Activities done by those humans within a fraternity

6th street tonight was full of frativity.

Frativity by Rileyjalowy October 3, 2015