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A verb meaning to completely and utterly wreck all of the other players in a lobby of a first person shooter, usually a game of the Call of Duty franchise (the home of MLG), usually by way of quick-scoping, no-scoping or hacking.
I'm gonna 420blaze this lobby so hard
Man, bad luck you got so 420blazed yesterday....
by Notwhalicus December 13, 2014
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