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1.
A video that has subtitles
This movie is subbed.
by sharkya May 03, 2008
 
2.
To subscribe to a topic, e.g. a thread in a forum. In internet language also often abbreviated by "sub'd" or "subb'd".
1. I'm glad I subbed this thread.
2. Subb'd!
by gorgonzola2 February 17, 2014