Jack-in-the-box-pop-up-artist 

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

Jack-in-the-box-pop-up-artist by TGDub September 1, 2009

Jack Frost Special 

When you eat ice cream during the dead of winter, or generally when it's freezing outside.

"Jean says that she's cold and she's in the mood for my white creamy Jack Frost Special."

Jack Frost Special by Juvo415 December 10, 2009

Jack-Book 

To use someone's facebook account without their knowledge, and make hilarious and/or embarrassing wall posts, status updates or name changes.

"Damn, someone jack-booked my status to say I'm looking for hookers tonight."

Jack-Book by riders994 December 10, 2009

Jack Nibs 

-noun

1. No thing. Not anything.

2. A cleaner way to say "jack shit".

Boss: How were sales today?
Employee: Lame! I haven't made jack nibs all day!

Jack Nibs by thin n8ey September 4, 2010

Jack Bauered

The act of hanging up after a phone conversation without saying goodbye.

Jack Bauer- I found the orphans! *end call*
President- ok i will.....i hate it when he does that. it should be named after him or something. Like getting Jack Bauered.

Jack Bauered by The final 4th May 2, 2011

Jack Murillo 

Demerit

He is such a Jack Murillo

Jack Murillo by ladeedadeeda123 May 4, 2011

Jack Horner-ed 

The popular children's rhyme reads:

Little Jack Horner
Sat in the corner,
Eating a Christmas pie;
He put in his thumb,
And pulled out a plum,
And said, "What a good boy am I!"

To be "Jack Horner-ed" in the modern/urban sense is a wholly awkward moment for any young person. This unexpected event takes place when two individuals are taking part in any type or degree of consensual sexual activity, when one partner decides to attempt a very risky maneuver by inserting his/her thumb into a certain orifice of the other partner which traditionally only operates as an exit for digestible waste. This NONconsensual activity generally results in an abrupt ending to the sexual/physical relationship, as well as any emotional relationship that had previously been forming. In most cases, this marks the final interaction between the individuals.

The origin of this term can be traced as far back as Kalamazoo, MI (Western Michigan University) where it is also popularly referred to as being "ZD-ed."

Let's say a young man is watching a Disney movie with a pretty girl he recently met. In the nights prior, they had slowly advanced their degree of sexual activity to a comfortable point. Justly, he felt certain enough of his the budding relationship to share it with other members of his close social group. On this particular night, the man propagates sexual activity. He is excited to realize his partner is also up to the task. As she begins to perform oral sex on him, in fact, near the height of the experience, the young man is alarmed by the presence of a thumb working into his anus. Quickly clinching, hoping to intercept the errant advance, he reaches for his pants and knows he has been Jack Horner-ed.

Jack Horner-ed by AV13 April 20, 2013