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29.
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.
Player 1: I just switched to All Out Attack.

Player 2: Oh no, he's goin' balls deep!
by WHATEVA March 14, 2005
 
1.
(verb) To go into the vagina completely..up to the balls
(adjective) All the way in...balls slapped up against the pussy
"Yo Pete...you get balls deep up in that Mandy Moore bitch yet? "
by woody bania February 02, 2004
 
2.
1) (adj) Specifically, the act of inserting the dick into an orifice up to the hilt, such that the balls rest against the orifice.

2) (adj) generally, the act of doing any activity hardcore, all out, and as fully as possible.
ex 1. Q: Where were you last night?
A: Balls deep in some slut's filth.

ex 2. We hit the bars balls deep last night- I feel shitty.
by Proud to be November 16, 2005
 
3.
When a male inserts his penis into a partner all the way to the testicles.
"It was great, I was balls deep in this chick."

"Shit dude, my moms walked in while I was balls deep."
by Mary L August 04, 2005
 
4.
to insert your penis into the vagina (or other orafice) until your balls rest against the orafice.
I'm going to go balls deep.

by G January 08, 2003
 
5.
A pork sword buried to the hilt; the maximum length which it is possible to slip someone; in a sausage and donut situation . The maximum extent to which the sausage can be hidden.
We were at it for hours i was balls deep all the way.
by Moose McEvil December 06, 2005
 
6.
Full penetration on a pussy or asshole
Dude, I went balls deep on that chick's ass I met last night at Denny's
by Assman August 24, 2003
 
7.
1.deep sexual penetration in which the balls are almost in too.
2.can be used as an expression for something overwhelming, ridiculous, exaggerated, or to refer to a large number of things. Also as an affirmative when answering a question
I'm balls deep with broads trying to get at me.

"Are you in to go to tijuana tonight? IM BALLS DEEP"
by Prado February 17, 2008