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3.
A Grey-Hat is a term given to Gandalf the grey by some stupid idiots who think that he is a computer Hacker
Gandalf the Grey-hat
by The guy who decided to die November 29, 2010
 
1.
A grey hat is some one with a mixture of black and white hat experience. Usually, a grey hat is someone who performs network security or system security analysis for organizations.
BOB the grey hat will scan your webserver for vulnerabilities for x amount of $. When he gets home he will reverse engineer microsoft products using stolen windows code.
by sunka_tonka March 21, 2006
 
2.
Someone who works on the computer, especially hacking that hacks into systems not to look for anomalies or to destroy a system. They're basically in there screwing around causing minor or no damage.
Kevin Mitnick
by silver bishop February 01, 2004