The type of person that you would only fuck on your couch because they aren't worthy of your bed.
"I can't believe that he took his fugly ex-girlfriend back. I saw that she commented his Facebook saying that they were up on his couch all night. He wouldn't even take her to his bed because she is such a couch hole."
A hardo is a person who tries extremely hard at everything. Most times a hardo will try very hard at things that do not require excessive effort. For example, sports practices, gym class, etc.
Wow did you see Jack at practice today? What a hardo!