I've never done it, but the 3800 manual says you can.
You'll know soon enough when you try it:
CLI: Configuring Switch Meshing
Syntax: [no] mesh [e] < port-list >
Enables or disables meshing operation on the specified ports
All meshed ports on a switch belong to the same mesh domain. Thus, to
configure multiple meshed ports on a switch, you need to:
1. Specify the ports you want to operate in the mesh domain.
2. Use write memory to save the configuration to the startup-config file.
3. Reboot the switch.
"show mesh"