tube definition, from Internet Connection, Inc.

1. n. A CRT terminal. Never used in the mainstream sense of TV; real hackers don't watch TV, except for Looney Toons, Rocky & Bullwinkle, Trek Classic, the Simpsons, Babylon 5, and the occasional cheesy old swashbuckler movie.

2. [IBM] To send a copy of something to someone else's terminal. “Tube me that note?”