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A title you can earn in World of Warcraft. It Requiers you to kill the final boss in the Wrath of The Lich King expansion on either 10 or 25 man mode.
Scrub: Dude!! You guys got server first on the Lich King! Grats.

Leet Raider: Shut up I only talk to other Kingslayers.
by MK Keyo April 22, 2010
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2
What a fuckboy would call himself
Fuckboy : I'm a kingslayer

Me: ugh Alex you're not a kingslayer you're a fuckboy
by Maybebaby6 November 15, 2016
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