As a verb, the process of putting one's head up one's own ass while (or before) placing both feet in one's mouth. In short, self-beclowning to such an epic level that it has, until just now, defied definition.
As a noun, the proof that the usage of methamphetamines, the mindless reliance upon a thesaurus, and access to the Internet do not mix well.
"Donald Trump just totally IGDed himself at that last convention."
"Charlie Sheen has just committed to full-on IGD."
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