1. Clicks on websites meant to appeal to people's hatred towards someone or something.
2. An appeal to anger and hatred. They became popular after President Obama was elected and website traffic declined drastically for left-wing blogs who survive on ad revenue. They shifted their hatred towards President Obama and started to appeal to the racist crowd.
Glenn Greenwald at Salon.com loves to get hateclicks on his articles to fulfill his lust for bashing President Obama.