The expression "Tank it" derives its origin from the term "tank" in slang usage, where it commonly designates a person or a player who is able to take or handle the brunt of something (such as alcohol, aggressions, enemy fire, enemy attacks, difficult situations, criticism, reprehensions, etc.). It is therefore used as an encouragement similar to "You can do it", "Keep it up", "Go all out", "Stand strong", "Pull through" or even "Good luck" and "Break a leg"; while implying that the person directed should be strong and be able to take care of the situation no matter what the odds against them may seem to be.

WARNING: Should not be confused with the more standard verb "tank", meaning "to fail", as in "I tanked my exam" (i.e. "I failed my exam; I did poorly on my exam"). Though this verb is rarely employed in the imperative form, speakers unfamiliar with its secondary slang meaning may interpret it the wrong way.

comes from mmorpgs, where you would have a healer in your party and a person with high defense. (i.e. meat sack-o-shield warriors). the warrior rush an opponent and the monk would do their best to keep the warrior alive with healing and stat bonuses. then, the other members could
a)fight and hit hard
b)run away like scared little girls

so, in essence, it is a big distraction to open opportunites for attack or to run away, like a sacrifice but to keepp it alive.

expression that typically describes a card play (e.g. Texas Hold'em) who pauses and thinks about his / her next move for an unusually long time

A Zombie That Took Way Way Too much roids I mean look at the guy fuckin hell he has big muscles I mean how can The survivors survive concrete getting thrown at them.

Dropping salt nicotine on a bowl of weed and snapping it

verb: meaning to fail

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.