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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
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