Smoke crack worship satan. Meat roll (Urban slang, you can guess this one).
Train track drawings. SOS bisected with either a cross or a long dagger. There was a language of symbols for the wanderers once called Hobos: http://www.worldpath.net/~minstrel/hobosign.htm. Drawings would be posted on the fences of homes for wandering people to share information. I suspect some of the postings in these abandoned houses are the modern equivalent of Hobo Symbols.