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25.
Adjective: To end in failure. (Related to the expression down the tubes.)

Possible origins:

1. To pull the chain on an old fashioned elevated toilet tank in order to flush fecal matter from the commode.

2. Flushing something down the toilet so that it ends up in the septic tank.

3. When a prototype ship model design fails hydrodynamic testing in a water-filled tank.

4. Naval aviators who fail to pass the dunker (Helicopter Underwater Escape Training) which is conducted in a large water tank.
When did our relationship start to tank?

My grades are really tanking this semester.

During testing the new ship design tanked straight away.

Ensign Smith just tanked the HUET test.
by HarpoonJohn February 24, 2010
 
1.
1. Any person who is exceptionally large, either in terms of height, wieght; being built.

2. Any person who is exceptionally strong.
Man! Hes a friggin' tank!
by }B3N{ March 08, 2004
 
2.
Noun: A player-character, typically in a MMORPG, that is able to occupy an agressor and take the brunt of the aggressor's attacks while the other players deal damage, heal, or perform some other action. The "tank" can survive longer while taking damage than the other characters. Typically, the tank has higher hitpoints (health) and a higher armor rating than the other characters. Less commonly, a character with a lower armor rating can perform the actions of the tank by using avoidance abilities. Ultimately, the tank needs to be able to occupy the agressor without dying. The method employed, whether avoidance or absorption, does not matter, as long as the tank can mitigate damage in some way.

Verb: To "tank", or "tanking", would be the action of performing the duties of the tank as described above.
1.N. That warrior is a good tank because he can take a lot of damage and he has a lot of hitpoints.
2.V. The warrior is tanking the mob right now.
3.V. Do you think you can tank this mob for us?
by Ignotus September 02, 2005
 
3.
1. Armored military vehicle used for assaulting the enemy with a swivel mounted cannon.

2. A container used to hold liquids.

3. Not a Rogue, Ranger, or Monk in fantasy roleplaying video games.
by Superior intellect September 12, 2003
 
4.
verb, to drink heavily (alcholic beverages).

noun, one who drinks heavily (alcholic beverages).

adjective, drunk or intoxicated.
Dudes, let's go tank!

He was tanking bigtime.

Man, you are such a tank!

I'm so tanked!
by FarmBoy November 17, 2005
 
5.
to deminish rapidly, to crash
G.W.'s approval rating really has tanked over the past couple weeks
by Pablo January 22, 2003
 
6.
v. To persevere through a bad situation that would normally depress or discourage anyone else. Derived from the MMORPG term "tank" that refers to a character role that soaks damage but fails to die.
Man, three exams, senior project, and girlfriend issues? Henry really tanked through that one.
by antonythomas September 01, 2009
 
7.
An epic computer game involving 2-4 players firing projectiles, ranging from small misseles to atom bombs, at each other, attempting to destroy each other's tanks. This game is famous for douche moves such as air strike, super shield, teleport kamikaze attack, and teaming up on noobs.
Dude, do you want to team up on Matt in this game of tanks?
by Chunky Reddy December 28, 2008