someone who plays minecraft for an extended period of time. This term is a portmanteau of "craft" (minecraft) and "Crackhead", denoting the addictive properties of the game minecraft.
I am a crafthead, and i'm proud of it. No wonder Microsoft wanted in on the minecraft and ported it to xbox 360. it has to be the best non-halo XB360 game ever, even though it's simply a shadow of the PC version.