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When a person or thing does something that is extremely efficient and/or Powerful
Or something that is generally Gil approved:
EG: Machine-Gunning, Being not gay, Helicoptering, Being generally Indestructable

Also see : Gil Approved
1. "I have engineered the hell out of this computer to the point that it has become Gil-Iffic"

Person: I have murdered nick, twisted off his head, and then raped his mother

Gil: Maximum Gil-Iffic
by Illmitch5 December 03, 2008
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