It's a magical mystery finger magic that can consume you. It is also a name to use on the groviest greviest people usually called Albert.
Person 1: "You are such a green grove"
Person 2: "Oogdy boogdy"
A Green Grove is a person whos name starts with the letter A, an example is Albert. These people are part of a Wizard Group and they scavenge for green herbs to heal other people.
Person 1: "Where is the Green Grove, my son is sick and he is the only one who can heal him"
Person 2: "He currently lives in the big forest"