white hat

white hat

noun Informal.
a virtuous hero, especially in a cowboy movie; good guy. Compare black hat (def. 1).
white-hat, white-hat·ted, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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White hat is always a great word to know.
So is slumgullion. Does it mean:
a stew of meat, vegetables, potatoes, etc.
a chattering or flighty, light-headed person.
Collins
World English Dictionary
white hat
 
n
informal
 a.  a computer hacker who is hired by an organization to undertake nonmalicious hacking work in order to discover computer-security flaws
 b.  Compare black hat (as modifier): a white-hat hacker

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Dictionary.com's 21st Century Lexicon
Main Entry:  white hat
Part of Speech:  n
Definition:  a computer programmer hired to prevent illegal acts such as hacking a forbidden network or sending out a virus or worm; also, a computer expert, usually a former hacker, who now uses his or her skills for legitimate causes; also called white hat hacker
Etymology:  fr its use in western /cowboy movies
Usage:  computing
Dictionary.com's 21st Century Lexicon
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Slang Dictionary

white hat definition


  1. n.
    a good guy; a hero. (From Western movies where you could tell the good guys from the bad guys by the color of their hats: white for good, black for bad.) : He seems like a white hat, but he's a worm.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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