Tanked (adjective) - The quality of being very energetic.
Tankish (adjective) - The quality of being very strong.
Tankishness (noun) - The amout of strength someone has.
Timmy is tanked up today.
Timmy looks tankish in that picture.
That tight T-shirt really makes Timmy's tankishness show.
Verb: To "tank", or "tanking", would be the action of performing the duties of the tank as described above.
2.V. The warrior is tanking the mob right now.
3.V. Do you think you can tank this mob for us?