An adjective to describe something that takes alot of bravery, or alot of balls. This word is usually used to describe something crazy done by the high kid down the hall.
Friend One: Hey did you hear Mike tried to jump into a pool under the express way?

Friend Two: Yeah, that's the ballsiest thing he's ever done.
by ImmaLetYouFinishBut November 16, 2010
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very brave

a person who has a lot balls to do something

sometimes called balziest
guy 1: dude did you see that video of that squirrel punching that bear in the face!

guy 2: i know that's the ballsiest squirrel I've ever seen!
by jhon lennon November 20, 2010
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The person who has the most balls is the ballsiest person
Ray William Johnson: "That is by far the ballsiest cat I have ever seen! Is 'ballsiest' a word? Balls.. Ballsiest is now a word!"
by xXHeyBobXx November 18, 2010
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That cat fighting the alligators is the ballsiest cat I have ever seen!
by RWJrocksursocks November 17, 2010
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