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."
Detroit-based Insane Gangster Disciples set formerly active around West Chicago Rd. and Wyoming. Known for the “2-15-19” BOS tag and a crooked “I” symbolizing “Insane.” Their graffiti clashed with local Vice Lords over turf and respect. Likely defunct.
“The West Chicago Insane GDs / WCR IGD left their mark with ‘2-15-19’ tags, but most of their walls have been painted over since the city cleaned up the neighborhood.”
And dying in yo' bed many years from now, would ya be willing ta trade all da days from dis here day ta dat fo' one chance, just one chance, ta come back here as young men an' tell our enemies dat dey may take our lives but dey will never take our freedom ... YUB NUB!