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.