When a man sees a women he finds to be sexually attractive, he can announce said phrase to announce his desire to have intercourse or the approval that he would have intercourse with said female.
Jordan is walking in the mall with his friends and a very attractive female walks by. Jordan announces to his friends "Sign Me Up", announcing his desire to have intercourse with said female.
by YS3 & AOT September 16, 2012
Available Domains :D