An interjection, often used in place of "for real" or "I'm serious;" an indicator of sincerity.
If you touch my woman, I will mess you up. Ballsdeep.
by Errgh February 22, 2005

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When ur having sex and ur so far in that the only thing stopping u from going further in is ur balls.
John was in balls deep, and he heard the unmistakeable sound of a fetus screaming. This is the day he realised his wife was pregnant
by the white one May 08, 2007

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(verb) To get a Blow Job and have your Balls resting on the bitches chin.
I was Balls Deep while that bitch gave me head!
by John Holmes 69 September 25, 2006

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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

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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
I was balls deep in your mom lastnight.

Man...That chick I met lastnight, I took her back to my place and went balls deep on that shit till the sun came up.
by BIGGDAD September 11, 2009

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An adjective describing something that is incredibly positive or enjoyable, awesome
"Doin' a girl's ass balls deep is ballsdeep." - MC Fumunda
by Fetorpse August 17, 2003

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Being dead serious
Are you serious man?

Balls deep.
by seriously cheesy August 10, 2009

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