Any person who loves the Rush Limbaugh radio show. Ditto heads totally agree with Rush's opinions and stand behind him without question. The word ditto was first used by a caller on his show who agreed with the accolades given Rush by a previous caller. The praise Rush was given by callers was becoming too long winded and Rush promoted the use of ditto by his callers as a means to be brief and to show their approval at the same time.
I really love Rush Limbaugh so I guess you could call me a (ditto head).