Can I split my electrical mains in two so I can have an independent meter in my outhouse?
Probably not, but typically the utility will simply supply multiple drops for you. If you wanted to have two meters, the split would have to occur before the meters. Not many utility companies would be thrilled with this, as unmetered taps would be a major concern.  

Also if you split the service, you'll be limited by the ampacity of the supply conductors. So if you pay for a 100 ampere service, you'll be limited to 100 amperes for both buildings. Whereas if you were to get two service drops, you could use 100 amperes in each location.