A mixture of both "great" and "good" used by the Cheerleader in Teen Girl Squad (issue/tissue#4). Seemingly originated from a spelling mistake by Strong Bad.
"Grood! I mean... good. And great. Great and good."
Person 1: Hey thats pretty grood
Person 2: what does grood mean
Person 1: its a combo of good and great
Person 2: why would someone even combine the two
Person 1: *bitch slap*