To slew or cheat an online poll by repeatedly voting (clearing cookies, using proxies) or to make a blog appear to be commented by numerous posters by the same means. (From the practices of the Free Republic or "freepers")
The results of the CNN question of the day were running 70:30 in favor until an hour ago when it got freeped.
A team on Lord of the Rings Online that worships their own false sense of superiority and utter lack of pvp skill. "Have you hugged your EC / GV today is their main slogan." On rare occasions, a "freep" will be brave after which their team quickly subdues and medicates the affected individual.