Tractor Jockey

1) (UK usage) A rural (male) youth who can't afford a 1992 Ford Escort so spends too much time tinkering with his Tractor (also works as a euphemism for wanker)(see also Rural Chav).
2) (USA usage) An enthusiastic tractor operator (see wanker)

1) (UK usage - insult)You are a real Tractor Jockey!
2) (USA usage midwest - compliment) Are you a real Tractor Jockey?