Any place that serves particularly disgusting, putrid, or inedible food. ("Ptomaine" refers to amines or alkaloids produced by putrefying organic matter, typically animal tissue. Used in reference especially the dining facility of institutions such as schools or military barracks.) I would avoid that restaurant at all costs—it's a real ptomaine domain.
ptomaine-domainand ptomaine-palace (ˈtoˈmen...)
n. any institutional dining facility; a mess hall; a cafeteria. Welcome to the ptomaine-domain. Help yourself to some mystery meat. Time to go over to the ptomaine-palace and eat—if you can call it that.