Term used in the Marine Corps for slacking off. Geedunk is a place to get snacks. Geedunkin' is what you're doing when you're getting snacks when you're supposed to be working.
John: Man, we're tired from washing planes all day, where were you?
Jeff: Ah man, I was geedunkin', big time!
Jeff: Ah man, I was geedunkin', big time!
by Palmdogg November 26, 2009