1. Someone who has a skin tint of grey.
2. Someone who is quite athletic, but is scarcely seen outside.
3. Someone who is a pacifist, but trains for martial combat.
1."Josh needs to get out more; he's turning into a Grey Kid."
2. Guy 1 "He can do an awesome backflip"
Guy 2 "Why doesn't he come to the park more often?"
Guy 1 "He's a bit of a Grey Kid.
3. Person a : Why doesn't Tim deal with those douchebags?"
Person b: "Didn't you know? He's a Grey Kid."