When someone is insanely good at something. Typically used by gamers
signifying the other player is
better than them. When you lose all your health and are 1 shot, you yell out to your teammates, "YO WTF HE'S CRACKED BRO, I'M OUT... HE MUST BE HACKING" you could also use it as a
reference to tell your teammates that the enemy team is low in health, however, it's more commonly used as a way to describe someones talent or skills nowadays.