Describes an activity that although it takes up a great deal of time to complete, it's an enjoyable experience nonetheless, like oral sex when the girl is not in a hurry to finish.
When my old girl started to give me head, I was on a slow boat to china.
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!