In dotA, using your hero to absorb enemy damage.

Effective when pushing, a tanker can absorb large amounts of damage while the rest of the team can focus on killing the enemy heroes.
Pudge: Look at the lvl 1 fv tanking those creeps. What a nub.
Faceless Void: stfu fattie, b0w dwn! 11! one!

later...

Faceless Void: 1 HoT and 2 Butterflies. I'm a tank.
Pudge: I'm so damn fat.
by jschmidty89 January 20, 2008

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The process by which a person expels excrement into the toilet tank, instead of the bowl, resulting in a disgusting surprise when one flushes.
I'm tanking in Mr. Dookie's toilet!
by Boner and Asshole May 24, 2009

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When its a race to get to the bathroom after your stomach has been hurting so bad and taking the biggest shit possible.
Dude: O MY GOD IM GOING TO TANK !!!!
*he runs to the bathroom*
Dude2: O my god hes tanking in my bathroon ....
by Mark-Shadows October 30, 2009

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(Australia)
This refers to a player in a computer game that is gaining excess hitpoints and armour, thereby being more difficult to eliminate by his/her enemies
I don't want to fight with my character yet. I would be tanking my hero instead
by Hungynguyen January 22, 2008

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to perform fellatio.
im tanking my boyfriend tonight!
by imapriest April 13, 2009

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Doing so poorly as to be in the toilet
Boy, my team is really tanking today!
by Janet Pinter January 20, 2008

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to be physically abused or beaten.
"her ma gave her a right tanking when she got home"

"i tanked that bitch"
by gemma the llama January 20, 2008

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