To tank something is to do badly or at it, or fail. One usually does this on tests that one is unprepared for. Tanking is the verb of tank.

Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy

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."

To be excessively drunk

1: to be intoxicated

2: to do very bad in
3: to launch, throw, hit, something very, very, very far.

Taking an attack with minimum damage, showing high durability.

excessively drunk. Usually used by a college crowd or a fraternity