To send friend requests via Facebook, Myspace, Twitter, or any other social network to very many people at a time.
Usually for people who just want to have as many "friends" as they can.
Girl #1: Oh my God, you just got 50 new facebook friends? How did that happen?
Girl #2: Oh, I just blast friended, it was so obnoxious, but now I have so many friends!
Girl #1: Yeah.... "friends".