The Slam Club is informal, existing any time two or more Slammers convene and compulsively denounce other people, places or things.
Malcontents pervade our society, routinely sabotaging the good feelings normal people exchange.
I call these killers of good feelings Slammers and their social groups the Slam Club. Incredibly, Slammers believe that opinions, when collective, are facts. They garner these collective opinions by socializing, with other Slammers. Voila, Slam Club. Slammers earnestly believe that by slamming third parties to you, they are helping you.