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A bone in occurs during intercourse between a male and a female, when the female has exercised her vaginal muscles to the extent that she is able to force her labia through the base of the male's crotch, absorbing a large portion of his pelvic region.

It can also occur during sex between two males, where the receiving male has exercised his anus enough to perform the act.

Scholars are still unsure whether this came before or after the bone out.
I love my girlfriend, but I'm afraid she may want to bone in.

If you're on the road to prison, it may be valuable for your well-being to master the technique of boning in.
by SpenSpenni January 17, 2011
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Gay sex between two males.
Did you hear about Dave and John? I heard they went bone to bone.
by Joey Orgler 3 September 12, 2008
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Having sex with a corpse so long since dead that all that's left of it's remains is a skeleton.
Friend 1: "Where's Tommy?"
Friend 2: "He's with your mom."
Friend 1: "Dude, my mom's dead."
Friend 2: "Yeah... he's boning bones."
by GentleOnJames November 30, 2016
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Screwed, Fucked, Caught, Dead, in process of or about to be killed
*Bender:Are we boned? .... Leela: Ya we're boned

*Oh if i dont get this done i'm boned

*yup he's boned
by Angel Of Fire 34 October 28, 2003
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1) (v) To have sexual intercourse. "Your aim is to bone" -- Tribe Called Quest (Classic example of a date rape).
2) (n) Penis. "You can act like a doggy, and play with my bone" -- Schoolly D. (Another poem ??). 3) (n) One dollar.
3) (n) Core, soul. "I'm a rock hard trooper to the bone" -- Public Enemy (Louder Than A Bomb)
4) (v) To bone out, as in leaving. "They all got in the car and boned out" -- Smokey (Friday 1995).
5) (n) A joint. "Smokin' bones in the staircase" -- Wu-Tang Clan (C.R.E.A.M. 1993).
by VAKI5 September 14, 2003
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