When some asshat decides to post several messages to a social networking site (like Twitter or Facebook) or blog within a short period of time (often within minutes). The result is flooding your friend's feeds with posts from you. It is often considered annoying and you end up losing followers & friends due to excessive feed banging.
Boing Boing has been feed banging me all fuck'n day.
I hate Robert, he's a total feed banger.
Holy shit, Sally just feed banged me!