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
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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?!"
by The One Who Sees... June 21, 2011
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when your magic stick is at max travel in your partners anatomy
i usually prefer to be balls-deep bout three times a day....only a sufer knows the feeling
by Big BNP January 30, 2004
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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 4, 2005
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to insert your penis into the vagina (or other orafice) until your balls rest against the orafice.
by G January 8, 2003
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Paris Hilton takes it ball deep in her porn film!! She deserves an academny award
by fashizzle May 3, 2004
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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
by HappyDickFarting May 23, 2010
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