Two meanings:

1) Intoxicated, nearly always pertaining to alcohol.

2) When a film does poorly at the box office.

Person A: "Did you see the Hulk?"
Person B: "No. I heard it tanked, actually."
The Hulk
New York Minute
Glitter
Crossroads
Dungeons and Dragons
From Justin to Kelly
The Alamo
The Real Cancun
Troy
Spy Kids 1, 2 and 3
Gigli
Scooby Doo 1 and 2

etc etc etc
by Ryan Thompson July 12, 2004
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The word tanking, in terms of sport, would be used to describe a bad performance

Tanking is the act of giving up a match or "throwing it away", losing intentionally or not competing.
I tanked my match so bad!

She was tanking her match.

He tanked the match after losing the first set.

They tanked their match because they got angry with the referee/umpire.
by Morrha January 22, 2008
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To be excessively drunk
I went out last night and got tanked
by Chris November 18, 2002
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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 9, 2004
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the ultimate chick magnet. can be seen put putting around in the roughest parts of town. intimidates other vehicles on the road. distinct gun metal paint job. not only is it bulletproof, but also rpg proof. has broken the speed of light and the speed of sound. Because it has broken the speed of sound, sign language is a key for communication while inside the tank. can seat 6 brave soldiers at a time. only down fall is that it cannot be used in stealth operations, since you can hear the fucking tank roll up from over 10000 miles away.
ho #1: did you see or hear the tank screech by last night?

ho #2: i did. my panties come off every time i hear or see the tank.
by (,)(,) July 18, 2011
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Taking an attack with minimum damage, showing high durability.
The Third Raikage tanked Naruto's Futon: Rasenshuriken

The tank tanked that rocket!

Superman tanked the missile and saved the day.
by SSM12 September 27, 2012
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A person that's completely lying about the truth.

When everyone knows your lying but you proceed with lying.
(Guy1) I stick potatoes into car mufflers & watch the cars blow up.

(Guy2) MAN HOMIE, WHY YOU TANKING IT ?!?!?!?
by mr. lan September 14, 2009
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