1) In general, it describes a state of mind where you are trying your best and going all-out.

More specifically, it's a phrase used to describe the extremely hardcore state of mind a player is in when he uses the "All Out Attack" offensive strategy in NHL 2004/2005. It is usually used as a desperation strategy when you're getting your butt kicked by your friends.

When ur having sex and ur so far in that the only thing stopping u from going further in is ur balls.

he stuck his whole package in, including his lovenuts

Balls Deep reffers to having your penis as deep inside of something as possible.....all the way down to the balls. Balls deep can mean any number of places as well...mouth, ass, vagina.

Balls Deep is a term that was coined by my brother Dan and Im proud to say I use it atleast once a day

To describe a situation, event or person that is highly notable or deserved of much recognition.

Putting in extra effort into doing something. Giving a 110% effort into something. Used in marketing to describe a strategy of launching a product or business.

1. To literally have a dick inside you as far as it can go.

2. To be very into something.

3. To be concentrating hard.