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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
 
15.
an armored vehicle used in military warfare to gain advantage by the use of heavy machine guns and a cannon.
The tank rolled slowly through the streets of Berlin.
by Akuneko the Sly August 04, 2004
 
16.
A person who is well built physicaly, for example they have a fully sick body with 8% body fat, and is ripped to the max
"Toan from Broadmeadows is a TANK"
by toan December 11, 2003
 
17.
A very well known army vehicle. The tank saw its first action in the trenches of WWI. The Germans in WWII used their tanks effectively on all their fronts (Western Europe, Eastern Europe, North Africa, Balkans). The Germans used the tank to take over all of Europe, specially Erwin Rommel, who used his tanks wisely in North Africa. The Germans should be known as the fathers of tank warfare. After WWII, tank technology improved, with more armor, radar, and more firepower. The American Armies in Iraq used tanks to decimate columns of Iraqi armor and infantry. Today, tanks are still in army service, and the Russians also use them to crush civilian unrest. The tank is giant leap in ground warfare.
Tanks are versatile vehicles and they carry devastating firepower.
by your daddy June 30, 2003
 
18.
a really cool, hot guy. especially someone strong or good at sports
what a tank
by eatmebabythefridge January 28, 2009
 
19.
an object or person (usually large) that does amazing amounts of work. A small object or person can be a tank in special circumstances.
That goalie was a tank. You could not get the puck past him.
by eggrog33 May 05, 2009
 
20.
A person or object that can deal with emotional, physical, or mental issues and make a bad ass outcome.
Brad hangs out with Scott for a week

John: Brad is such a tank! I can't believe he's hanging out with the most annoying kid in school!
by CnLBurst July 28, 2011
 
21.
Somebody who can do things others cant.
Somebody who has muscles, is bulk and/or is tall.
Somebody who is huge.
Somebody who is pretty amazing.
Aaron, your Tank
by Dannnnnnnni August 10, 2010