Similar to saying something is tubular. Tube is a shortform of the latter. Means what you are talking about is very unique, special, exciting, or good.
For example, one could use "Tube" in place of cool in almost any given situation:
"That new gyroball that Chris got is pretty 'Tube' eh Matt?"
Tube cannot replace cool in the following situation:
"The temperature of the air is cool" - meaning chilly or cold
"That new gyroball that Chris got is pretty 'Tube' eh Matt?"
Tube cannot replace cool in the following situation:
"The temperature of the air is cool" - meaning chilly or cold
by BJLOVE{bob} March 10, 2004
Get the Tubemug. 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".
by Bundas April 30, 2013
Get the In the tubemug. "The Tube" was made up by Brandon DiCamillo, who frequently talks about it on Radio Bam. The Tube is a long, clear plastic tube. It is used in a competition where two people, preferably men, insert an end into each of their anuses. Then they both defecate. The winner is determined by whose feces comes out the other side.
by Jessica Mdizzle February 27, 2008
Get the The Tubemug. by Andy MacFadyen January 21, 2004
Get the tubemug. 
When a server is overloaded by over-zealous using.
Althought the term was created by PA, tubing is not only through their linking to other pages.
Althought the term was created by PA, tubing is not only through their linking to other pages.
by Cheezu$ June 6, 2003
Get the tubedmug.