Hack (v.) -

In graffiti terms, to hack is to take either a pen, pencil, or marker and draw a clear line through another's hard work. Why one might choose to hack another's art is usually justified because the artwork was tagged by an opposing artist or personal rival. In some cases, the art just might not appeal to the "hacker" for numerous reasons.

v.

1. To program a computer in a clever, virtuosic, and wizardly manner. Ordinary computer jockeys merely write programs; hacking is the domain of digital poets. Hacking is a subtle and arguably mystical art, equal parts wit and technical ability, that is rarely appreciated by non-hackers. See hacker.

2. To break into computer systems with malicious intent. This sense of the term is the one that is most commonly heard in the media, although sense 1 is much more faithful to its original meaning. Contrary to popular misconception, this sort of hacking rarely requires cleverness or exceptional technical ability; most so-called "black hat" hackers rely on brute force techniques or exploit known weaknesses and the incompetence of system administrators.

3. To jury-rig or improvise something inelegant but effective, usually as a temporary solution to a problem. See noun sense 2.

n.

1. A clever or elegant technical accomplishment, especially one with a playful or prankish bent. A clever routine in a computer program, especially one which uses tools for purposes other than those for which they were intended, might be considered a hack. Students at technical universities, such as MIT, are famous for performing elaborate hacks, such as disassembling the dean's car and then reassembling it inside his house, or turning a fourteen-story building into a giant Tetris...

a person who is a professional at doing some sort of service, but does crappy work.

a clever solution to a tricky problem

A political appointed flunky who either doesn't want to work or who is so stupid they can't work

A popular way to catch a ride in more so the NorthEastern side of the nation, in large innercities of high concentration. The person usually stands on the road and says something to the effect "Yo, you got me on a hack, 'round there to a nearby location?" to the driver of the car.

If accepted the driver becomes a temporary cab driver, and usually the hackee is suppposed to give directions, although they are usually trying to be cool, and just point like some dumbasses.

At the completion you give the driver like a small bill like a $5 or $10.

As I said popular in the New York, Philidelphia, and Baltimore regions of innercities. No offense but usally ghettos.

All the definitions here plus:
As an acronymn for Horses Ass Carrying Keys. Prison slang referring to a prison guard.

A taxi driver in any city, not necessarily New York. In NYC, hack can also refer to a livery cab driver (cabs that drive in bad neighborhoods where taxis usually don't).