This is totally insecure and just a proof of concept. I find myself annoyed that parent modules have to exist prior to creating their children. Modules are a form of namespacing code and we should be able to organize that code however we want.

modules.rb

#!/usr/bin/env ruby

def create_module(representation, &block)
  parts  = representation.split("::")
  (0...parts.size).each do |idx|
    const =  parts[(0..idx)].join("::")
    eval "::#{const} = Module.new unless defined?(::#{const})"
  end

  if block_given?
    Kernel.const_get(representation).instance_eval(&block)
  end
end


create_module("Prehistoric::Cave::People") do
  class << self
    def fred
      p("FLLLLLIIINSTONE")
    end

    alias :wilma :fred
  end
end

create_module("Wow::This::Is::Really::Deep") do
  class << self
    def yep
      p("woot")
    end
  end
end

Prehistoric::Cave::People.fred
Prehistoric::Cave::People.wilma

Wow::This::Is::Really::Deep.yep