Not to be confused with "Post Pardum Depression" which is a serious medical condition requiring treatment, "Post Hardon Depression" generally passes on it's own. It occurs for a man, following sex when he is left with that feeling of ennui, so well expressed in the Peggy Lee song, "Is That All There Is?"
Seeing Farquar's long face, George asks, 'What happen...you look like your dog just died?' Farquar replies, 'No, nothing like that, I just had great sex with my girlfriend, but now have Post Hardon Depression.' George, replies, 'Oh man, I feel your pain.'