When you cut a hole in a box, preferably cardboard, and nut inside it.
"I walked in on my friend Jacking a box."
by PoperlichkingGerila December 13, 2018
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A hater that stays talking breakfast 24/7, A rat that if he knows what's good for him stays out of my trap.
You snitched again dog? Yous a jack in the box ass nigga; always talkin breakfast.
by never talkin dinner July 11, 2011
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n., Someone who comes in and out of your life. There one minute gone the next.
You can never count on this person to be there when you need them. They show up when it's convenient for them, usually with a hidden agenda.

I.E. On the 1st and 15th, I can expect a visit from my favorite jack-in-the-box-pop-up-artist
by TGDub September 1, 2009
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Sexual act:I was with my girlfriend this weekend, I was really horny and asked her if she could jack n the box me off.

Egging your opponent while playing a video game: Hey! u suck!! why dont you jack n the box me off too!!
by JYW1 January 4, 2011
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Noun

A game played with a maximum of four friends who are male. Each participating member cuts a hole in the side of the same, covered box. Each member then proceeds to lower their pants and underwear and masturbate (hence the "Jack").

Each member should attempt to orgasm at once. Should any particpant orgasm early or late they are eliminated. At the point of orgasm, all particpants must put their penises in their hole in the box and shake the box around.

Once all members have finished, the lid will be removed and each player will attempt to guess whose semen it is that is now on their penis.

One would believe that the semen would be that of the man immediately across from you, however this is not often the case.

The player whose semen covers the most penises wins.
We played Jack Box last night at that sausage fest party. I won, but I was tired for hours after.
by KinkySasquatch January 15, 2018
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(v) The act of shooting somebody in the head. Popularized by the 50 cent song 'Heat'
Man, I was playing Gears of War and made somebody's brains jump out the top like jack in the box.
by DieLawn August 29, 2007
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the act of using your tongue to penetrate the anus of your partner during sexual foreplay
I want to tongue jack fart box

Matt: "Damn girl, I want to tongue jack your fart box!"

Jason: "She tongue jacked my fart box last night"

Raaaaaaandy: "Yes! I can tongue jack your fart box!"
by Brian, winona September 20, 2009
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