Hyper-agressive players are constantly making others make "all your chips" decisions. That's my take. Generally if you see someone who has touched most of the chips on the table, he's hyper agressive. And everyone is waiting to catch him. I had one recently. He went from 800 to 2000 to 1200 to 2200 to 1200 to 600 to out, basically that fast. On a 10 player table with 800 chips per person (8000 chips total), he "touched" 8400 chips in the span of 15 hands or so. That's a hyper-agressive player.