It's just the word Grundle. It's one of the top 3 or so funny words on its own, in any setting. It's like kaka (caucau? I don't know how to spell it, the word for shit you say when you're like 8) in that regard.
Every time I see it I laugh. Though it's mainly because this one time in college we were playing drinking "never have I ever" and some girl just blatantly outed her friend at the table as a grundle licker. To the grundle munchers credit, she played by the rules and admitted the truth. Said she was in a year long relationship and didn't want the guy to get bored...Ok then. Anyway, the story still cracks me up to this day, and the word Grundle will always appeal to my immature nature.
