it is an ending that ends with EVERYONE HAPPY, and is not dirty or sexual in ANY way. FAH and ramo aka princess and the bear is a real life example of this situation.
When a girl (usually Asian) gives you a full rubdown with the exception of your cock, which is rock hard now, and looks up at you and says, 'You want Happy Ending?'
A massage that is normal until the end where you turn over and ask for a "full body massage" and the masseuse (usually asian) takes off the towel and gives you a handjob. It usually costs extra.
After dinner and the movies and making out in the car in front of the house, Brie Ann invited Tyrone up to her bedroom for a happy ending. Having sex was the happy ending for the date.