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usually an older female who has the ability to take two cocks at the sametime
david's mom is an avid double tuber
by z man March 10, 2005
The act of opening two web browsers to watch two youtube videos at the same time, or to watch a vid while uploading one.
Girl: you gotta see that new video on youtube!
Boy: but i'm uploading something important!
Girl: then start double tubing!
by TehEpicGuilmon August 18, 2010