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ballsiness 

The human quality leading to bold and aggressiveness action where others dare not.
He was a WEB developer who had the ballsiness not to bother making his pages compatible with IE6.
ballsiness by Holly Goodhead June 24, 2011
A person or animal who is brave or has balls.
Person 1: Is that cat going up against an alligator?

Person 2: That is by far the ballsiest cat I've ever seen!

(credit to RayWilliamJohnson)

balls, alligator, cat, bravery, kitten, rwj, raywilliamjohnson. ballsiest
Ballsiest by SantaBalls November 19, 2010
Another term used to describe someone having guts or courage to do something.

This usage of this word tends to stem from shallow uptight girls who try to be cute to make up for their lack of mature appearance.
That was a ballsie thing to do.
ballsie by Mikey September 1, 2004

ballsier 

that you or someone has more balls than another person.
Kevin is way more ballsier than Michael.
ballsier by bayssa December 2, 2010
A brassiere for your balls (boxer briefs that support your package)
Hanna: Wow, Andrew's package looks great

Joe: Ya, cuz he's wearing a ballsiere.
Adjective - Used to describe an a fearless act.
Q: Did that cat just bitch slapped two gators?

A: Yep, that the ballsiest thing I have ever seen.

Credited to a midget internet troll named Ray William James. I kid because I care!
Ballsiest by JoeYGunZ November 26, 2010