gistfile1.rb

class MyModule < Module
  attr_reader :description
  def initialize(description, *args, &b)
    @description = description
    super(*args, &b)
  end
end

class Foo
  include MyModule.new('has SPECIAL ivar') {|mod|
    define_method(:description) { mod.description }

    def greet
      "Hi, I'm a special module that #{description.downcase}"
    end
  }
end

p Foo.new.greet