firefighting n. 1. What sysadmins have to do to correct sudden operational problems. An opposite of hacking. Been hacking your new newsreader? No, a power glitch hosed the network and I spent the whole afternoon fighting fires. 2. The act of throwing lots of manpower and late nights at a project, esp. to get it out before deadline. See also gang bang , Mongolian Hordes technique ; however, the term firefighting connotes that the effort is going into chasing bugs rather than adding features.