the act of stealing one's bundle of grapes subtley off the kitchen counter, buffet, or bowl from a friend/host's house. not to be mistaken for grastic confusement, or confusing plastic grapes with actual juicy fruit and hurting one's gums.
Mmmm juicy grapes! I don't want to be proper and take a few at a time. I need juicy now!! I must commit a "grobbery ".