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8.
Inserting penis far enough into vaginal canal that the testicles push against the outside of the females body.
While peering through a window Josva exlaimed; "John is definitely balls deep in Mel right now!"
de idon'tusecondoms 4 décembre 2007
 
9.
To thrust one's penis into a women's vagina to a point where pushing the balls in wouldn't make much
of a difference or.... all worth while.
Women: "Ohh, Deeper, Deeper, Harder, Harder!"
Man: "I can't bitch! Im Balls Deep already!!"
de Tommeh Arris 9 janvier 2009
 
10.
Verb - To take a risk for a potential reward
I went balls deep trying to bone my hot neighbor.
de KorinthianJailer 2 mai 2011
 
11.
The act of sheathing one's cock to the hilt into another's orifice of preference.
"My best friend's wife squealed with pleasure as I sank my man-stalk balls deep in her pink starfish."
de Sweltering Satchel 29 avril 2008
 
12.
Metaphor: the events of being deeply involved with something, this could be your homework; or something which has nothing to do with testicles or the length of orifices.
a. hey man what's happening?
b. im balls deep in my homework right now

a. that party last week was nuts
b. yeah! it was balls deep!

a. hear about that volcano eruption?
b. yeah it totally wreecked my neighborhood
c. eh, I was balls deep in the lava
de HappyDickFarting 23 mai 2010
 
13.
In the literal sense, this means to insert the penis in its entirety into a females vagina, leaving nothing but your balls outside of said vagina.

It can also be used to imply that the action or event was taken to its extreme, with no other possible courses of actions available.
Joe: "Dude I came back to my controller and you were balls deep up in my ass."

Me: "Ahahahahahaha!" *accidently walks off cliff on map Jungle in Black Ops

Person 1: "Dude, we're balls deep in the Middle East now that Obama's president."

Person 2: "Not as deep as I was in your mom last night."

Person 1: "WTF?!"
de The One Who Sees... 21 juin 2011
 
14.
To overly indulge in something
me and my friend are going to be balls deep in the drink tonight!
de herbyboyyy 12 avril 2010