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LulzSec (a.k.a Lulz Security) is a computer hacking group that began making headlines in May of 2011 after taking responsibility for compromising the security of a number of high profile targets. They have be known to use Distributed Denial of Service (DDOS) attacks and SQL injections to take down websites. (See also: #OpSony)
The group periodically releases stolen information from websites. They post the stolen data on their website in .txt files or in torrents on their page on The Pirate Bay. Releases often are posted on Fridays and thus they made a hash tag called “#fuckfbifriday” that they use to tweet with.