Phrase meaning - Fully reachable through on-line chat, email, and phone. Typically used in an collaborative work setting to denote that you will be out of office, but easily reachable. Originating in the southeast, it may be a derivation stemming from the old office mail suction tubes - "able to be reached through the tubes".
I'm working from home today "in the tube".
af Bundas 30. april 2013