tuber 

1) n. In New England, it is a brass musical instument, conical in construction, about 18 feet long, with a large mouthpiece, and is the lowest of the brass instruments. It replaced the ophiclede in the symphony orchestra, and has nothing to do with Wagner Tubas. It has only one direct cousin in brass instruments, that being the fluglehorn, for all other brass instruments are more cylindrical than the tuber, even the french horn.
2) n. For the rest of the English-speaking world, it is a fleshy-rooted plant like a potato or a yam. Hence, New Englanders and Non-New Englanders can get confused at times, as evidenced below.

An actual conversation:
Denny: Dan, can you play the tuber for the Bristol, RI band next weekend?
Dan: Well Denny, do you want me to play 1st or 2nd potato?

tuber by Dan1271 November 13, 2007

tuber 

A low-class member of the internet comment brigade. Derived from intertube and youtube combined with the fact that many tubers seem to have roughly the intelligence and shape of a potato, this being a different kind of tuber. Tubers can generally be recognized by the fact that their comments bear little to no relevance to the subject at hand.

News article: "The Norwegian election may have been rigged."
Tuber 1: "how do i post coments?"
Tuber 2: "the REAL problem with this country is the two party system that allows for rigging!"
Tuber 3: "TELL EVERYONE THAT ASHLEY IS A TWO TIMING WHORE"

tuber by NorCur July 25, 2011

tuber 

A Tuber is an Underground root system, you morons. It has to do with plant systems.. Wow.

A potato has a tuber growing underneath it in its soil.

tuber by Amanda April 5, 2005

Tuber 

Someone who enjoys watching adult videos on the internet

Im a hardcore tuber

Tuber by sharkpower November 18, 2014

tuber 

Giving or receiving a blow job

She gave him a tuber...It was great.

tuber by [e-mail] January 28, 2016

Tuber 

Best nickname ever. Generally used for someone who watches a lot of TV.

That guy there, his name is Tuber
Tuber?
Well, Anthony, but, he calls himself Tuber.

Tuber by Neelix September 3, 2006

Tuber 

A person who watches videos on youtube daily, often people who like uploading and commenting on videos.

Sam: Hey Jim, I saw your youtube profile page last nite, you watched over 1,000 videos!!

Jim: Well i was kinda bored.

Sam: You are a tuber now!

Tuber by Platni65 September 12, 2009