Jimmy is some dude who edits kawaks, mame, etc. and then packages it up new roms like svcplus, metal slug and kof2003 and puts perfect on them who god knows the reason why. Then it gets uploaded to romman.net and tries to pass itself as a "perfect" version so people can download it. Make sense now? So basically... lets say kof2003 comes out. Okay, now "jimmy" takes that mame emulator, slaps his name and logo on it, packages it with kof2003 and passes it like he was the one that created it.