Short for Oh my Gackt; a play on OMG. It implies that you see Gackt as a God.

Note: Most people who use OMGackt use it to make fun of Gackt/Gackt fangirls.
Some girl said, "OMGackt!", but was actually serious about it, so Mitchi and I had to rip off her arms and use them to strangle her.
by Yaoi-chan August 12, 2004

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