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.
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 game by placing computer-controlled lighting panels in its windows.
2. A temporary, jury-rigged solution, especially in the fields of computer programming and engineering: the technical equivalent of chewing gum and duct tape. Compare to kludge
3. A cheap, mediocre, or second-rate practitioner, especially in the fields of journalism and literature: a charlatan or incompetent.
v1. I stayed up all night hacking, and when I finally looked out the window, it was 8am.
v2. Some script kiddie
hacked into the web server and trashed the database.
v3. I didn't have time to do things properly, so I just hacked together something that worked.
n1. A computerized bartender that automatically mixes your drinks and debits your account? Now THAT'S a hack.
n2. This subroutine is just a hack; I'm going to go back and put some real code in later.
n3. That two-bit pulp writer? Ah, he's nothing but a hack.