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1.
To have your civilization eaten or otherwise destroyed by Cthulhu.
You just got Cthulhu'd
by BadRobotBrain April 09, 2010
 
2.
To have an octopus or any other betentacled sea-nasty latch onto your face, usually with the more gribbly of appendages dangling down from the chin.
Holy Yath n'Gai, Batman! Steve just got Cthulhu'd!
by CthulhuRisen April 22, 2011