got a huge rabbit but has a mean streak

[Red Devil]

Good luck with him.. he is so cute

 

[Blue2Fyre]

I've heard it's just like with dogs. If you let a dog hump your leg, you let it assert its dominance. Next time he goes crazy just grab him by the scruff and try to hold him back without hurting him (or yelling). Just hold him back until he calms down, and after a few seconds, give him a treat.

I wouldn't suggest this. Rabbits are different than dogs. They are a prey animal so they have a flight response. In the wild a rabbit being grabbed by the scruff is being killed by a predator. Go look for a video of a ferret or stoat hunting rabbits. They go for the back of the neck. If you scruff a rabbit you run the risk of it panicking and hurting itself. Rabbits stress easily and can kick to hard they break their back.
I would get him neutered first. That should cut down on some of his aggression. A water bottle is a great way to discipline a rabbit instead of being physical with them. Be sure to reward him when he's being nice. He'll catch on.

It was nice of you to take him in. Many times people get cute baby rabbits and don't socialize them enough while they are young. Once they grow up and have behavior problems people dump them. He'll take some work but in the end it will be worth it