Kek literally translates to lol on World of Warcraft. When someone from the Horde side types lol in /say, members of the alliance side see kek instead. Not specific to Orcs.
Human Paladin: Dude, that Orc totally just pwned you.
Orc: Kek.
Human: Dude, now he's laughing at you. Kick his ass.
by evapor8ed March 22, 2006
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Not originally from World of Warcraft as some people think, 'kek' is the Korean approximation in english of laughter when typed on a Korean keyboard during Starcraft matches. As Starcraft was made by Blizzard as is world of warcraft, their connection to laughter in both games seems to be an homage of sorts.
Matt: OMGWTF you just got zerg rushed in the face!!!11
Trevor:Fuck that!
Matt: kekekekekekekeke
by Warcraft3 December 24, 2008
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Traditional laugh or chuckle produced by the Korean populous of most Battle.Net games.
"King cow no kill yo? Kek!"
by Man Of Hate February 07, 2003
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Kek is an onomatopoeia of the gurgling sound Donald Trump made in the Russian golden shower video. It was then adopted as a word of praise by white supremacists towards the ancient tentacle monster Covfefe, whom they fornicate with; hoping their praises would compel Covfefe to cleanse the world with a great golden flood.

Putin: mmmmm you are such a thirsty boy *micurates*
Trump: *gurgles* kek! keeeeek!

Modern Usage

White Supremacist: Praise Kek! The great golden flood is almost upon us!
via giphy
by Noah of Kek June 04, 2017
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literally translates to lol in Orcish. started talking in Orcish on world of warcraft, and they hear it as kek.
i just pwned you, kek!
by drat March 22, 2005
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