The meaning comes from riding mopeds, which are typicaly a slow form of transport. To get them to go faster, a rider can reduce their profile and improve their aerodynamics by laying flat on the fuel tank; "tanking it".
"Yeah, I was tanking it all the way"
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.
Tanking is the act of giving up a match or "throwing it away", losing intentionally or not competing.
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.
Something that you wouldn't want to stand in the way of.
• He was absolutely tanking it (with disregard to others).
Effective when pushing, a tanker can absorb large amounts of damage while the rest of the team can focus on killing the enemy heroes.
Faceless Void: stfu fattie, b0w dwn! 11! one!
Faceless Void: 1 HoT and 2 Butterflies. I'm a tank.
Pudge: I'm so damn fat.