In professional team sports, it means to "lose purposely" in hopes of getting a good draft pick for the upcoming season. Of course no one on that team will admit they are doing it purposely.
The Carolina Panthers are tanking the 2010 NFL season because they want Andrew Luck from Stanford quite badly!
by sportsguy2010 December 12, 2010
1. Noun: One who is exceptionally good at something.
2. Verb: Doing something exceptionally well.
3. Adjective: Possessing the trait of being extremely good at something.
4. Noun: One who is generally awesome.
1. Michael Phelps just got his 14th Gold Medal. What a tank!
2. Michael Phelps is tanking it up in the pool!
3. Usain Bolt is tanktastic!
4. Ryan Lochte is a straight up tank.
by American Playa February 07, 2010
Tank - (to be in the tank/ to tank somebody)

Being in the tank can be most closely described as sulking.

It is more accurately represented when a person usually of little moral character, strength or validity is upset, sad or unable to find joy because of something meaningless, trivial, relevant only to themselves or just plain stupid that has occurred that has caused them to sulk.

The resulting behavior from "being in the tank" usually manifests itself as inability to function even to perform the simplest of tasks, a concerted effort on the part of the sufferer to bring everyone around them down and a widespread lack of passion and enthusiasm.
John asked for a piece of candy from Adam, Adam said no and John was in the tank for hours just because he couldnt have some candy! (Grow up John)

Terry missed a few shots in practice and immediately was in the tank about it, because of this the whole team chemistry was fucked up. Get out of the tank Terry! Your ruining it for all of us! tanked.

Mary was acting way out of line last night so I shouted at her and put her in the tank, she deserved it. I tanked her.

I was trying to tank Hugo last over his poor ability to speak to women. i love tanking people.
by Mylo BaRD February 01, 2009
An armoured vehicle, first invented by the British and possible also the French in WW1. To be a tank it must have tracks and a 360 degree rotatable fully enclosed turret.
The greatest tanks of the modern age are:
Challenger 2,
Leopard 2,
by VampiricRat July 10, 2008
A Gatorade bottle made into a water bong with a pen.
Hurry up and make a tank, I have been craving this weed all day long.
by Kleep May 14, 2008
The act of removing a toilet tank lid, standing on the seat, and taking a dump in the tank of a toilet. Best done in public restrooms, always a crowd pleaser at the office too.

Also known as the Upper Tanker, 2000 Flushes Brown, Upper Decker, Going Up Top, and The Gift That Keeps On Giving. For a nice twist on this see Upper Deck Deluxe.

"Man, they fucking fired me so I tanked that fucking toilet on my way out!"
by sirbrutus July 12, 2006
to have intercourse with,
to get/be drunk
man I got tanked at steves house, then this chick came round and i tanked her all night long
by missilepenguin June 20, 2004

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