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1.
1- A Hacker (Or rather cracker, but that's a different discussion) who uses his abilities for malicious purposes.

2- Anything relating to malicious use of the internet.
1- as a hacker, I would have to say he's definately a black hat hacker.

2- since the software's ony use was generating registration keys for legitamite software, it was considered balck hat software.
od uživatele Mr.Mysteriosity 07. Září 2003
 
2.
n. (Hacker Lingo) Hacker who uses his or her skills for malicious purposes and/or personal gain. Defacing websites, writing viruses, stealing personal information, and booting people off chat programs are all considered blackhat activities.
The blackhat is loathed by many in the hacker culture, who prefer the chivalrous vigilanteism of the whitehat to the blackhat's destructive and selfish tendencies. However, blackhats generally do deserve respect for their remarkable abilities - the exception of course being the script kiddie.
od uživatele progamer124 05. Únor 2004
 
3.
A hacker who uses his skills for unethical destruction.
"Those damn Black Hats hacked my website!"

"Josh is the biggest Black Hat going around"
od uživatele Flash Lover 28. Únor 2010
 
4.
opposite of whitehat , a black hat is a "hacker" that does not "work" for money but for what he belives in, or just for fun...
Everytime a blackhat turns into a whitehat , god kills 3 kitten
od uživatele kurt cobain 01. Srpen 2004
 
5.
evil
The black hat hackers are the ones that cause damage. White hat hackers do good with their hacking
od uživatele Don 11. Září 2003
 
6.
Noun: An adventure vlogger on YouTube who travels and is often referred to as Black Hat or BlackHat but goes by the user name BlackHat2005. Although the 2005 in the name is not widely known, it is thought to be no coincidence, and a secret. This is not the case, however, the reason is only told upon request.
In addition, it is often assumed that he is in someway affiliated with the group of hackers also known as blackhat, it is said that this name is used not in attempts to copy these people, but is rather for personal reasons.
Have you seen that awesome traveling vlogger Black Hat?
od uživatele BH'05 23. Říjen 2012
 
7.
(Somebody using) optimization tricks that artificially boost search engines rankings, using methods that usually break the search engines' TOS.
Examples of blackhat techniques are cloaking, stuffing pages with keywords or links and using unnatural redirects.
The term was inspired by old western movies' villains always using a black cowboy hat.
See also SEO Spam and black hat SEO.
od uživatele Blackhatknight 30. Květen 2005