Why does he say “hit him good”? What does it mean?
"Hit him good" is an expression that means to hit something or someone really hard. Grizzly says this because he wants Pan Pan to hit Ice Bear with the crowbar. He thinks if Pan Pan "hits him good," then Ice Bear will return to his old self. This expression can only be used in specific instances where something or someone is being hit. It really isn't a very common expression for everyday instances.