Specifically, someone with a baby's emotional maturity, the stature of a midget, who is raging uncontrollably. The result is usually both disturbing and hilarious.
Kate: Hey, check out that football player on the field. He keeps aggressively snuggling after the whistle's blown.
Mary: Oh my gosh, why is he raging?! He makes me frightened by his tiny ferocity.
Kate: Oh, it's no big deal. He's just clearly your typical ribget.