When something is real messed up. Also, when something goes wrong and people laugh that would also be mad grimey. And when something isn't right. Also, when sumptin is not supposed to be funny but is.
A Kid Throws up in Class and everyone laughs; that's madgrimey.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi
May I have an order of regular degular buttermilk pancakes? Without all the added jazz? Hold the blueberry smiley face, strawberry glaze, chocolate chips and whipped cream.