What is Ballsie?
1.
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.
See
2.
A gentle banter-type remark to get a slagging match underway.
How are you Ballsie?