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This is an acronym for High Orbit Ion Cannon, a Distributed Denial-of-Service client. It seems to be an "upgraded" version of its low orbiting variant, the LOIC

The author is anonymous, an internet group promoting freedom of speech on the internet.

The tool was known to be created in regards to the infamous "wikileaks" attacks, also known as "spreading Derpes", the denial of service attacks to different payment processors denying wikileaks donations were vast and very organized.

Used mainly in Operation Leakspin

The tool is for testing purposes only, therefore the creator, who remained anonymous was not liable of any misuse, as seen in his/her disclaimer.

The high orbit ion cannon has the following features:
- High-speed multi-threaded HTTP Flood
- Simultaenously flood up to 256 websites at once
- Built in scripting system to allow the deployment of 'boosters', scripts designed to thwart DDoS counter measures and increase DoS output.
- Easy to use interface
- Can be ported over to Linux/Mac with a few bug fixes (I do not have either systems so I do
- Ability to select the number of threads in an ongoing attack
- Ability to throttle attacks individually with three settings: LOW, MEDIUM, and HIGH
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AnonHQ: "Ready up the Lazarz. "
Anons: "Low Orbit or High?"
AnonHQ: "We're hitting them big this time, prepare the HOIC"
Anons: "High Orbit it is."
Anons: "Attack Initiated."
AnonHQ: "Target Confirmed Down. Period of time to keep down: 24hours."

*24 hours later*

AnonHQ: "Cease Attacks. No lonewolfs."
Anons: "Roger That. All Attacks Have Ceased."
HOIC by http://www.Derpes.com December 12, 2010
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To raise or part one item/object from another. This usually involves something that will move back into place of it's own accord.
He hoicked his but cheek to the side to allow a clean wipe of his arse.
hoick by Wacko! November 8, 2006
Related Words
From the BBC describing Tiger Woods at the British Open:

Hole one: Woods opts for a three wood instead of a driver and smashes the ball into the first cut of rough on the left.

With a bit of a hoick, Woods blasts his second shot just through the green. His third pitches on the edge of the green and rolls left of the hole to within five feet. He slots the putt in safely.
Two-over-par
hoick by Tom Z July 18, 2003

Hoicular Activity 

When one exibits ho-like behavior.
Tameka, you need to stop all that Hoicular Activity in public, I can't take you nowhere.
Hoicular Activity by Quevon October 10, 2007
A mistyping of the word choice that also means allegra is the shiz. and taylor likes two bananas.
I don't have a hoice.
-What? you like two bananas?
hoice by Taylorisawesome April 16, 2009
a person that will tell you the truth about the way you look
The hoick told her that her hair looked bad purple.
hoick by Mel July 2, 2003
TDD is the name of a cult created in a christian school in Italy that believes in the "Hoichi" the wich is defined as the "scream of pleasure" of Asian females. The humans who can execute the Hoichi are called "Hoichi Yellears".
"I heard a great hoichi on pornhub last night!"
"I want to become a hoichi yellear, but i do not have the asian genes..."
hoichi by FishermanAntony January 28, 2018