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!
Guy 1: Yo did you see the painting I made
Guy 2: Yeah it was pretty Geewub Shabadorf
Guy 1: What?
Guy 2: ๐๐คณ๐ธ๐ฆ
Guy 1: Dude you're Geewub Shabadorf'ing me right now Guy 2: Sorry I didn't mean to...