Slow clap is a term used to describe the delayed onset of Gonorrhea, a bacterial infection that is transmitted by sexual contact. Where 'The Clap' usually comes on shorty after sexcual contact with a person infected with the disease, Slow Clap comes on much later, thus more slowly.
Baz - "You remember that Essex bird I pulled at Magaluf in the Summer? I've just been down the clap clinic and they said I must have got it from her!" Dave - "Dave, that was months ago. I know your jokes are shit but it sounds like she gave you a proper Slow Clap mate!
The best show on televison ever until the 5th season, when it went into a massive decline as a direct result of Aaron Sorkin leaving. While many of the ideas in the show were very, very improbable in a real-life political situation, it still managed to educate more people on the workings of politics than almost any other form of fictional television entertainment (with the possible exception of The Daily Show). Basically rocks my world.
The West Wing is the best TV show ever; President Bartlet needs to take over.