Game Grumped is a term used for when someone, instead of sitting through the tutorial, skips the tutorial and goes through the Game without knowing what they are doing.
"Don't you want to know what to do?"
"Nah, I'm just gonna Game Grump it by not going through the tutorial."
Game Grumping or Game Grumped it is when someone doesn't go through the tutorial of a game.
An especially hot and steamy shit. Grumpers often leave you very sweaty and exhausted. They're mostly taken under less than ideal situations like port-o-johns and bar bathrooms.
Man I was tailgating on Saturday and I had to shit some fierce. I went to the port-o-John and dropped a fiery grumper. My asshole was never the same.