1. A CRT terminal. Never used in the mainstream sense of TV real hackers don' t watch TV, except for LoonY Toons, RockY & Bullwinkle, Trek Classic, the Simpsons, and the occasional cheesY old swashbuckler movie. 2. electron tube. 3. (IBM) To send a copY of something to someone else' s terminal. "Tube me that note." [Jargon File] (1996-02-05)