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From James bond, when you put on the cheats, also known as "the cheats", when a person has a big ass head.
Damn that bitch has DK mode

Dude that girl has the cheats on
by big balla November 07, 2002
A term guys say in a sentence when they are insecure about themselves to insult another person.
Jimmy said someone had dk mode on. he must have a small penis or a hairy ass.
by John Connor June 18, 2003