I would like to add a 100 amp panel to my outbuilding. Unfortunately for me my main household panel is maxed out. Can I run two panels from my single meter and how is this accomplished?

Typically you cannot. You need to come from a feeder breaker some how.

Having read a few more posts, I was under the impression that I could run the outbuilding froma "double lug" at the meter is this incorrect? If I can , would I also have to remove the bonding from the ground / common? Would I need a earth ground at the outbuilding? Sorry if these are stupid questions

Typical single meters have fixed lugs that cannot be replaced and ARE NOT suitable for double wires.

I am unsure of your ground/common question. If you mean in the meter pan the answer is a definite no. The neutral is mounted/bonded directly to the enclosure. There is NO way to reverse or undo this.

All structures supplied with a service or feeder require some form of grounding electrode, as well as bonding of metallic piping systems and structural steel if they exist.

I was referring to the bonding in the load centers. Was under the impression I could only have one link from neutral to ground. Such as in a sub panel setup. Sorry for the lack of clarity, just working through some options.