This paper states that college radio invokes two ends of a language spectrum -- the clean language authorized for on-air use and the dirty language prohibited from such use, and that the interaction between the two produces "expositional obscenity," a catalytic form of discourse that invites the audience to render a judgment about questionably obscene material. Obscenity is an ambiguous realm of language that the Supreme Court has judged to fall outside the safety of protected speech covered by the first amendment. In the current climate of deregulation and the benchmark of community standards, potentially obscene material has emerged as a common form of radio programming. College radio is a significant contributor to the acceptance of obscene programming by conventional radio broadcasters. In the process of airing expositional obscenity, college broadcasters initiate the public's acceptance of questionable material and ultimately broaden the scope of conventional radio discourse. The process is a healthy one for the college students, conventional broadcasters, and the spirit of free expression. Four notes are included. Contains 10 references. (Author/RS)