To fuck someone the full length of your penis until you hit with your balls
I was balls deep in sarah last night
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When the penis is so far in the vagina, the balls are the only thing on the surface.
Rob kept thrusting till his testicles hit her ass. He was balls deep and kept thrusting, but only with much more force.
by Well, shit. December 23, 2017
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(verb) To go into the vagina completely..up to the balls
(adjective) All the way in...balls slapped up against the pussy
"Yo get balls deep up in that Mandy Moore bitch yet? "
by woody bania February 3, 2004
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the phrase "balls deep" comes from pinball machines. when you want to launch the ball full force you pull the plunger all the way back, otherwise known as going, "balls deep."

no just kidding that one actually means what you think it does
balls deep actually means going so far in that your balls touch
by FlashlightMemelord October 13, 2018
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To insert one's penis into any of the three holes on a female up to the balls, so they slap against the our edge of the hole.
Tom: I got balls deep in Mindy at Jennifer's party right there in the kitchen.
Nate: Dang, Tom! I wanna slam her hard. Did you know that your brother got balls deep in her too afterwards when you were drunk?
Tom: That hoe... She had more fun than me!
by Sexy Stripper Queen March 7, 2017
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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
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A man is fully inserted in the woman during sex.
I went balls deep in that chick.
by bluntboyED June 15, 2014
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