To survive and continue to live relatively healthily beyond all scientific reasoning.
The word has it's origins in Metal
Gear Solid 2: Sons of Liberty with regards to a particular character Vamp, who gets shot in the head with a .45ACP round and lives to run on
water, get shot lots more, run up walls etc.
Meatsack 1:
Joey fell off the Empire
State yesterday.
Meatsack 2: ZOMFG NOWAIZ!! That's terrible!
Meatsack 1: It's ok, he's totally
fine. Looks like he pulled a vamp.