jackernaut
A jackernaut is someone who can take more damage than a fat kid on a rollercoaster. They don’t get fazed by explosions or bullets. They just keep going.
"I took 10 bullets and still killed you. I’m a jackernaut.", @BulletBoy
"He got hit by a grenade and still ran me over. That’s a jackernaut.", @GrenadeNoob
"I got shot by a machine gun and still kept fighting. I’m a jackernaut.", @MachineGunMan