look up any word, like darude - sandstorm:
 
1.
When you submit a post to a thread and nobody responds, sign up with a couple of extra accounts. Make each of those accounts bump your post to make it more popular. This happens a lot on Digg, 4Chan, and so on.
This post really sucks, but 30 people bumped it. The same fag must samefag it over and over.
by Davery April 27, 2008
 
2.
A person who posts trying to:
-act like more than one person
-bump a thread

This could happen in the following:
-Imageboards
-BBS'es
-Forums
-Chatrooms
-IM applications
-blog comments
1. That person keeps samefagging on AIM.
2. Look at that samefag agreeing to his own post!
by Michael November 15, 2009