test.rb

module Awesomeness
  module ClassMethods
    def hello
      puts "YAY"
    end
  end
  
  def hello
    puts "hi"
  end

  def self.included(klass)
    class << klass
      include Awesomeness::ClassMethods
    end
  end

end

class Person
  include Awesomeness
end

Person.hello

Person.new.hello